Added documentation for MICROSOFT_CLOUD config calues

docs/features/sso.md

@@ -49,6 +49,10 @@ The following environment variables are required:
 3. `MICROSOFT_CLIENT_TENANT_ID` - Microsoft tenant ID - use `9188040d-6c67-4c5b-b112-36a304b66dad` for personal accounts
 4. `MICROSOFT_REDIRECT_URI` - The redirect URI configured in your Microsoft OAuth application. This must be set to `<open-webui>/oauth/microsoft/callback`.
 
+The following environment variables are optional:
+
+1. `MICROSOFT_CLOUD` - The microsoft cloud you are using for authentication. Defaults to global. Can also specify AzureUSGovernmentCloud and AzureChinaCloud
+
 ### Github
 
 To configure a Github OAuth Client, please refer to [Github's documentation](https://docs.github.com/en/apps/oauth-apps/building-oauth-apps/authorizing-oauth-apps) on how to create a OAuth App or Github App for a **web application**.

docs/getting-started/env-configuration.md

@@ -2524,6 +2524,17 @@ See https://support.google.com/cloud/answer/6158849?hl=en
 
 See https://learn.microsoft.com/en-us/entra/identity-platform/quickstart-register-app
 
+#### `MICROSOFT_CLOUD`
+
+- Type: `str`
+- Default: `Global`
+- Options:  environment variables mentioned in [Microsoft Entra authentication endpoints](https://learn.microsoft.com/en-us/entra/identity-platform/authentication-national-cloud)
+  - `Global` - uses microsoftonline.com for the domain
+  - `AzureUSGovernmentCloud` - uses microsoftonline.us for the domain
+  - `AzureChinaCloud` - uses chinacloudapi.cn for the domain
+- Description: Sets the cloud environment for Microsoft OAuth.
+- Persistence: This environment variable is a `PersistentConfig` variable.
+
 #### `MICROSOFT_CLIENT_ID`
 
 - Type: `str`