Unexpected text/html ContentType

What causes this issue?

Server Error:- Unexpected ContentType received from the call to the
Server

System Response

&V1&&V2&&V3&&V4&

How to fix this error?

Make sure the correct URL path is configured in middleware receiver
adapter and it matches the inbound communication service URL in the SAP
Cloud system.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.