Problems connecting Password Manager Pro in Remote Desktop Manager

I'm having problems connecting Password Manager Pro in my Remote Desktop Manager Enterprise Edition 11.0.16.0 (trial edition). I'm constanly getting the error...

"API key received is not associated to any user. Authentication failed."

...when I'm trying fetch the Ressource (the eclipse button) in the Add Credentials window (see attach file #1: ).

Also when I try to click OK in the window, I get the error:

"Credential is required" (see attach file #2: ).

I have added the Password Manager Pro account in File > My Account Settings > Password Manager Pro (see attach file #3: ).

I have also setup my API User in Password Manager Pro (see attach file #4: ) and copied the AUTH Token to the account in Remote Desktop Manager.

Please help !!!

Thanks in advance :)