Update env-configuration.md

docs/getting-started/env-configuration.md

@@ -2616,6 +2616,12 @@ If the OAuth picture claim is disabled by setting `OAUTH_PICTURE_CLAIM` to `''`
 
 See https://support.google.com/cloud/answer/6158849?hl=en
 
+:::info
+
+You must also set `OPENID_PROVIDER_URL` or otherwise logout may not work.
+
+:::
+
 #### `GOOGLE_CLIENT_ID`
 
 - Type: `str`
@@ -2646,6 +2652,12 @@ See https://support.google.com/cloud/answer/6158849?hl=en
 
 See https://learn.microsoft.com/en-us/entra/identity-platform/quickstart-register-app
 
+:::info
+
+You must also set `OPENID_PROVIDER_URL` or otherwise logout may not work.
+
+:::
+
 #### `MICROSOFT_CLIENT_ID`
 
 - Type: `str`
@@ -2682,6 +2694,12 @@ See https://learn.microsoft.com/en-us/entra/identity-platform/quickstart-registe
 
 See https://docs.github.com/en/apps/oauth-apps/building-oauth-apps/authorizing-oauth-apps
 
+:::info
+
+You must also set `OPENID_PROVIDER_URL` or otherwise logout may not work.
+
+:::
+
 #### `GITHUB_CLIENT_ID`
 
 - Type: `str`
@@ -2728,6 +2746,13 @@ See https://docs.github.com/en/apps/oauth-apps/building-oauth-apps/authorizing-o
 - Description: Path to the `.well-known/openid-configuration` endpoint
 - Persistence: This environment variable is a `PersistentConfig` variable.
 
+:::danger
+
+The environment variable `OPENID_PROVIDER_URL` MUST be configured, otherwise the logout functionality will not work for most providers.
+Even when using Microsoft, GitHub or other providers, you MUST set the `OPENID_PROVIDER_URL` environment variable.
+
+:::
+
 #### `OPENID_REDIRECT_URI`
 
 - Type: `str`