Why do I always receive 401 Unauthorized when I try to use the APIs?

Please check the authentication options of the AppServer URL in the IIS. The authentication there takes place before the request reaches the application server.

Hi Markus, thank you for your reply.
It tourned out that the problem was in the official One Identity Documentation, as the One Identity Support said to me. Even if the docs says that the url is https://[AppServerURLasFoundInTheDesigner]/AppServer/appserver/authmodules, this url is wrong: I had to remove an extra appserver from it. Using https://[AppServerURLasFoundInTheDesigner]/AppServer/authmodules as url works fine.

Thanks anyway.

The documentation is not wrong. https://support.oneidentity.com/technical-documents/identity-manager/9.1/rest-api-reference-guide/3#TOPIC-1873699

It states <BaseURL>/appserver/authmodules for this endpoint.

And BaseURL ist defined as https://<Hostname>/AppServer according to this https://support.oneidentity.com/technical-documents/identity-manager/9.1/rest-api-reference-guide#TOPIC-1873692

But you are right, in your sample, there is one AppServer too many, as your [AppServerURLasFoundInTheDesigner] already contains the first AppServer.

Hi Markus,

The documentation has been modified after I've opened a SR about it. The Support said that "it was wrong" and "misleading for IMOD".