I’m relying on workspace assignment via REST API to have the account user created in the workspace. This is like the workspace assignment screen at account level or adding existing user screen at workspace level. The reference URL is below.

Workspace Assignment Update

My code is attached. When I make the call with the appropriate parameters, the REST API call returns with status code 200 and the response has the appropriate details of the user. However the user doesn't appear in the workspace and is also not available when I try to retrieve the user at workspace level via a REST API call.

Any input or advise is appreciated.