Hi Shailesh,
I
came across your question when hitting the same issue trying to setup
Clever OAuth in a test bed and wanted to share what I ended up finding
in case it's useful: I used https://api.clever.com/me as the userinfo_endpoint. To get that
to work, though, you need to set appropriate user field mappings in
Moodle's service configuration as well. I ended up trying data-name-first --> firstname, data-name-last
--> lastname, and data-email --> email. Using that configuration, I
was able to login successfully with teacher / student credentials from the sandbox district.