Describe the bug
After configuring all settings, when the login button is clicked, I get the error:
error:invalid_request
error_description:The mandatory 'code_challenge' parameter is missing.
error_uri:https://documentation.openiddict.com/errors/ID2029

Even after removing the PKCE requirement, the error still persists

To Reproduce
Steps to reproduce the behavior:

1. Configure plugin with all necessary parameters.
2. Try login on the login page.

Expected behavior
The login page should be loaded.

Isolating the problem (mark completed items with an [x]):

• I can reproduce this bug consistently using the steps above.

WordPress Environment

• Website URL: https://www.wellahealth.com/community
• PHP Version:7.4.25
• WordPress Version: 5.9.3
• Plugin Version: Version 3.9.0
• Identity Provider: Custom OpenIdConnect provider. (uses OpenIddict)
• Relevant Plugin Settings: