3302332 - Subscription to Central Invoice Management failed and error "Couldn't subscribe to SAP Central Invoice Management" happens

Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental.

You are unable to subscribe to SAP Central Invoice Management. You can see following details when clicking on the failed subscription or "View details":

Couldn't subscribe to SAP Central Invoice Management. Please try again. If the problem persists, open a ticket using the BCP component: MM-IV-CIM.

Furthermore clicking "View details" in the "Subscription Failed" windows displays some text with the following message inside:

To subscribe this application link an Identity Authentication tenant to the subaccount with the "Establish Trust" option.

SAP Central Invoice Management

Subscription failed, Central Invoice Management, Identity Authentication tenant, IAS, establish trust, BTP subaccount , KBA , S2P-CIM , SAP Ariba Central Invoice Management , Problem