Service cannot be executed in this context.

We are calling custom sub-service on click of check-in button. The operation fails with the following error:

System code execution error. The service 'WORKFLOW_CHECKIN_SUB_CUSTOM' cannot be executed in this context.

Calling standard sub service like 'CHECKIN_UNIVERSAL_SUB'  also fails.

Trying to call the sub-service as calling the service results in a different issue(Security group not passed, unable to execute).

Any pointers are appreciated.