OAuth2 userinfo endpoint returning null response

Good day. I am using Spring Boot OAuth2 to authorize my incoming link application with Confluence. Everything works fine for the token exchange, the token is valid format, but when Spring hits the userinfo endpoint I receive a null response.

It has been suggested in other blogs that this could be because openid,profile are not in my scopes list. But when I add them to my scopes, I get an error when trying to visit the consent page, that invalid scopes are included. This is in spite of the inclusion of these standard scopes at https://auth.atlassian.com/.well-known/openid-configuration
I am only able to use scopes defined by Confluence; e.g., read:me, read:profile, etc.

I have some more detail posted here: oauth 2.0 - Spring OAuth2 IllegalArgumentException: invalid start or end on userinfo endpoint - Stack Overflow

Probably I am missing something obvious, but I am stuck on this. Any advice is appreciated!