I’ve seen this error happen occasionally in our logs as a response we receive from auth0’s management API! It’s rare and seems possibly related to a Management API Access Token being incorrect or expired, but I’m not sure.
Did you ever figure out what was going on? It’s confusing to receive a response from auth0 that isn’t JSON-encoded and doesn’t explain the actual problem. We also do not have a cloudflare layer, so this seems to be originating from auth0.