Postgresql - JWT Authorization error

Receiving the following error when I try to connect to Heroku Postgres and receive “JWT Authorization error. Error: could not retrieve public key from microservice”. The data source was connecting fine earlier, even retrieving data.

Javascript console shows “GET… 400 (Bad Request)”.

Also, I am not able to edit/delete the data source either. I tried adding a different postgresql database but still received the same error when I hit Test Connection or while saving it (it never completes the save process).

Any clue what could be going on?