For some reason, my Sales Cloud and Marketing Cloud got disconnected. I started the "usual" troubleshooting procedure - cleared out the tokens, but even after that I cannot reconnect them. When I go to MC tab in Sales Cloud, I am able to log in with my MC API user credentials, but if I try to click on Change Marketing Cloud User or Configure Marketing Cloud Connector I get the following message:
Sorry, something went wrong. We couldn't retrieve the API User details. Try again or open a support case in the Help and Training portal.
Does anyone have an idea what might be wrong?