Description

This is a follow-up on the PR #38830 . In Keycloak 26.2.0, the option allowMultipleAudiencesForJwtClientAuthentication was introduced to OIDCLoginProtocolFactory. This option is used just for the backwards compatibility and will be ideal to remove it in Keycloak 27 release.

This issue is to track removing the option and all the related code and update the documentation (upgrading guide) about this option being removed.