Hello,
In the error message you mention, there is a reference to SM_SP_0000010003 .
This is an RFC to SAP for ITSM and Maintenance Optimizer, in the scenario where you manage multiple customer numbers with one RFC for each customer. So, your Maintenance Optimizer is not using SAP-OSS.
The quick fix is to check RFC SM_SP_0000010003 in SM59. Either unlock the S user in the SAP Service Marketplace, or enter another S user and password for SAP customer number 10003.
Best regards,
Miguel Ariño