diff --git a/src/components/LoginPage.js b/src/components/LoginPage.js
index ad8cf94..e629e5c 100644
--- a/src/components/LoginPage.js
+++ b/src/components/LoginPage.js
@@ -169,7 +169,7 @@ const LoginPage = ({ theme }) => {
           : typeof error === "undefined" || !error.message
           ? "ra.auth.sign_in_error"
           : error.message,
-        "warning"
+        { type: "warning" }
       );
     });
   };
diff --git a/src/components/RoomDirectory.js b/src/components/RoomDirectory.js
index de602e9..b33a28b 100644
--- a/src/components/RoomDirectory.js
+++ b/src/components/RoomDirectory.js
@@ -86,7 +86,9 @@ export const RoomDirectoryBulkSaveButton = ({ selectedIds }) => {
           refresh();
         },
         onFailure: error =>
-          notify("resources.room_directory.action.send_failure", "error"),
+          notify("resources.room_directory.action.send_failure", {
+            type: "error",
+          }),
       }
     );
   };
@@ -118,7 +120,9 @@ export const RoomDirectorySaveButton = ({ record }) => {
           refresh();
         },
         onFailure: error =>
-          notify("resources.room_directory.action.send_failure", "error"),
+          notify("resources.room_directory.action.send_failure", {
+            type: "error",
+          }),
       }
     );
   };
diff --git a/src/components/ServerNotices.js b/src/components/ServerNotices.js
index 67d6334..2c10307 100644
--- a/src/components/ServerNotices.js
+++ b/src/components/ServerNotices.js
@@ -83,7 +83,9 @@ export const ServerNoticeButton = ({ record }) => {
           handleDialogClose();
         },
         onFailure: () =>
-          notify("resources.servernotices.action.send_failure", "error"),
+          notify("resources.servernotices.action.send_failure", {
+            type: "error",
+          }),
       }
     );
   };
@@ -129,7 +131,9 @@ export const ServerNoticeBulkButton = ({ selectedIds }) => {
           handleDialogClose();
         },
         onFailure: error =>
-          notify("resources.servernotices.action.send_failure", "error"),
+          notify("resources.servernotices.action.send_failure", {
+            type: "error",
+          }),
       }
     );
   };
diff --git a/src/components/devices.js b/src/components/devices.js
index 41c5918..fcc8684 100644
--- a/src/components/devices.js
+++ b/src/components/devices.js
@@ -1,11 +1,5 @@
 import React, { Fragment, useState } from "react";
-import {
-  Button,
-  useMutation,
-  useNotify,
-  Confirm,
-  useRefresh,
-} from "react-admin";
+import { Button, useDelete, useNotify, Confirm, useRefresh } from "react-admin";
 import ActionDelete from "@mui/icons-material/Delete";
 import { makeStyles } from "@material-ui/core/styles";
 import { alpha } from "@mui/material/styles";
@@ -34,7 +28,7 @@ export const DeviceRemoveButton = props => {
   const refresh = useRefresh();
   const notify = useNotify();
 
-  const [removeDevice, { loading }] = useMutation();
+  const [removeDevice, { isLoading }] = useDelete("devices");
 
   if (!record) return null;
 
@@ -43,21 +37,15 @@ export const DeviceRemoveButton = props => {
 
   const handleConfirm = () => {
     removeDevice(
-      {
-        type: "delete",
-        resource: "devices",
-        payload: {
-          id: record.id,
-          user_id: record.user_id,
-        },
-      },
+      { payload: { id: record.id, user_id: record.user_id } },
       {
         onSuccess: () => {
           notify("resources.devices.action.erase.success");
           refresh();
         },
-        onFailure: () =>
-          notify("resources.devices.action.erase.failure", "error"),
+        onFailure: () => {
+          notify("resources.devices.action.erase.failure", { type: "error" });
+        },
       }
     );
     setOpen(false);
@@ -74,7 +62,7 @@ export const DeviceRemoveButton = props => {
       </Button>
       <Confirm
         isOpen={open}
-        loading={loading}
+        loading={isLoading}
         onConfirm={handleConfirm}
         onClose={handleDialogClose}
         title="resources.devices.action.erase.title"
diff --git a/src/components/media.js b/src/components/media.js
index 78b99fd..703435b 100644
--- a/src/components/media.js
+++ b/src/components/media.js
@@ -129,7 +129,9 @@ export const DeleteMediaButton = props => {
           handleDialogClose();
         },
         onFailure: () =>
-          notify("resources.delete_media.action.send_failure", "error"),
+          notify("resources.delete_media.action.send_failure", {
+            type: "error",
+          }),
       }
     );
   };
@@ -172,7 +174,9 @@ export const ProtectMediaButton = props => {
           refresh();
         },
         onFailure: () =>
-          notify("resources.protect_media.action.send_failure", "error"),
+          notify("resources.protect_media.action.send_failure", {
+            type: "error",
+          }),
       }
     );
   };
@@ -186,7 +190,9 @@ export const ProtectMediaButton = props => {
           refresh();
         },
         onFailure: () =>
-          notify("resources.protect_media.action.send_failure", "error"),
+          notify("resources.protect_media.action.send_failure", {
+            type: "error",
+          }),
       }
     );
   };
@@ -264,7 +270,9 @@ export const QuarantineMediaButton = props => {
           refresh();
         },
         onFailure: () =>
-          notify("resources.quarantine_media.action.send_failure", "error"),
+          notify("resources.quarantine_media.action.send_failure", {
+            type: "error",
+          }),
       }
     );
   };
@@ -278,7 +286,9 @@ export const QuarantineMediaButton = props => {
           refresh();
         },
         onFailure: () =>
-          notify("resources.quarantine_media.action.send_failure", "error"),
+          notify("resources.quarantine_media.action.send_failure", {
+            type: "error",
+          }),
       }
     );
   };
diff --git a/src/synapse/dataProvider.js b/src/synapse/dataProvider.js
index 3165f01..27ffc94 100644
--- a/src/synapse/dataProvider.js
+++ b/src/synapse/dataProvider.js
@@ -41,14 +41,16 @@ const resourceMap = {
     data: "users",
     total: json => json.total,
     create: data => ({
-      endpoint: `/_synapse/admin/v2/users/@${data.id}:${localStorage.getItem(
-        "home_server"
-      )}`,
+      endpoint: `/_synapse/admin/v2/users/@${encodeURIComponent(
+        data.id
+      )}:${localStorage.getItem("home_server")}`,
       body: data,
       method: "PUT",
     }),
     delete: params => ({
-      endpoint: `/_synapse/admin/v1/deactivate/${params.id}`,
+      endpoint: `/_synapse/admin/v1/deactivate/${encodeURIComponent(
+        params.id
+      )}`,
       body: { erase: true },
       method: "POST",
     }),
@@ -92,10 +94,12 @@ const resourceMap = {
       return json.total;
     },
     reference: id => ({
-      endpoint: `/_synapse/admin/v2/users/${id}/devices`,
+      endpoint: `/_synapse/admin/v2/users/${encodeURIComponent(id)}/devices`,
     }),
     delete: params => ({
-      endpoint: `/_synapse/admin/v2/users/${params.user_id}/devices/${params.id}`,
+      endpoint: `/_synapse/admin/v2/users/${encodeURIComponent(
+        params.user_id
+      )}/devices/${params.id}`,
     }),
   },
   connections: {
@@ -137,7 +141,7 @@ const resourceMap = {
       id: p.pushkey,
     }),
     reference: id => ({
-      endpoint: `/_synapse/admin/v1/users/${id}/pushers`,
+      endpoint: `/_synapse/admin/v1/users/${encodeURIComponent(id)}/pushers`,
     }),
     data: "pushers",
     total: json => {
@@ -149,7 +153,9 @@ const resourceMap = {
       id: jr,
     }),
     reference: id => ({
-      endpoint: `/_synapse/admin/v1/users/${id}/joined_rooms`,
+      endpoint: `/_synapse/admin/v1/users/${encodeURIComponent(
+        id
+      )}/joined_rooms`,
     }),
     data: "joined_rooms",
     total: json => {
@@ -162,7 +168,7 @@ const resourceMap = {
       id: um.media_id,
     }),
     reference: id => ({
-      endpoint: `/_synapse/admin/v1/users/${id}/media`,
+      endpoint: `/_synapse/admin/v1/users/${encodeURIComponent(id)}/media`,
     }),
     data: "media",
     total: json => {
@@ -355,9 +361,11 @@ const dataProvider = {
     const res = resourceMap[resource];
 
     const endpoint_url = homeserver + res.path;
-    return jsonClient(`${endpoint_url}/${params.id}`).then(({ json }) => ({
-      data: res.map(json),
-    }));
+    return jsonClient(`${endpoint_url}/${encodeURIComponent(params.id)}`).then(
+      ({ json }) => ({
+        data: res.map(json),
+      })
+    );
   },
 
   getMany: (resource, params) => {
@@ -369,7 +377,9 @@ const dataProvider = {
 
     const endpoint_url = homeserver + res.path;
     return Promise.all(
-      params.ids.map(id => jsonClient(`${endpoint_url}/${id}`))
+      params.ids.map(id =>
+        jsonClient(`${endpoint_url}/${encodeURIComponent(id)}`)
+      )
     ).then(responses => ({
       data: responses.map(({ json }) => res.map(json)),
       total: responses.length,
@@ -410,7 +420,7 @@ const dataProvider = {
     const res = resourceMap[resource];
 
     const endpoint_url = homeserver + res.path;
-    return jsonClient(`${endpoint_url}/${params.data.id}`, {
+    return jsonClient(`${endpoint_url}/${encodeURIComponent(params.data.id)}`, {
       method: "PUT",
       body: JSON.stringify(params.data, filterNullValues),
     }).then(({ json }) => ({
@@ -427,10 +437,13 @@ const dataProvider = {
 
     const endpoint_url = homeserver + res.path;
     return Promise.all(
-      params.ids.map(id => jsonClient(`${endpoint_url}/${id}`), {
-        method: "PUT",
-        body: JSON.stringify(params.data, filterNullValues),
-      })
+      params.ids.map(
+        id => jsonClient(`${endpoint_url}/${encodeURIComponent(id)}`),
+        {
+          method: "PUT",
+          body: JSON.stringify(params.data, filterNullValues),
+        }
+      )
     ).then(responses => ({
       data: responses.map(({ json }) => json),
     }));