I'm trying to validate a token (/oauth/v1/token/) after requesting the authorization (/oauth/authorize)
We had success to connect with free HubSpot accounts (sandbox), but when we try to connect to our HubID account with Marketing Hub Professional, we receive an internal error.
My App ID: 188549
The HubID that I want to connect: 407592
We debug and simulate using the Postman, and we got the same problem.