Thank you for your post. I guess the docs need updating because it’s mentioned in the release notes starting from version 2.42 “remove OAuth2 from settings app v42”, and it’s mentioned in the ‘deprecated features’ notes that “The old and deprecated OAuth support will be removed” (see table ‘Removed features’ row 4).
If you face any issue to start using the new supported OAuth 2.0 then please feel free to reply here.
Thanks!