What could be the reason?

To properly configure your service connection to Salesforce Marketing Cloud your receive this configuration:

After making a call to this service you receive a ServiceUnavailableException.

What could be the reason?
A . Rate Limit is reached.
B . Commerce Cloud IP not whitelisted on Marketing Cloud.
C . Circuit Breaker is enabled on the service profile and max circuit breaker calls are reached in the allowed time interval.
D . Force PRD Behavior in Non-PRD Environments option in the service configuration is checked.
E . Service mode is Mocked.

View Answer

Answer: A, C