OAUTH_UNSUPPORTED_GRANT_TYPE

Issue

The identity provider does not support the grant type used in the token request. Glean uses the authorization_code grant type for OAuth flows, and the provider has rejected it.

Resolution

1. In the identity provider's admin console, verify that the OAuth app is configured to allow the authorization code grant type.
2. Some providers require explicit enablement of specific grant types in the app registration settings.
3. If the provider does not support the authorization code grant type, contact Glean Support to discuss alternative authentication options.

For additional assistance, contact Glean Support.