Using Custom Project Properties (e.g passwords) in Get Access Token windows

Hi!

I'm struggeling trying to use Custom Project Properties (using property expansion) in the Get Access Token window of the Auth Manager. Since I'm storing passwords in these custom properties I've encrypted them using the built-in functionality. I'm using OAuth 2 Flow with Client credentials. If I use the 'Client Identification' and 'Client Secret' in clear text I can get the token without issue, but if I try using property expansion ${#Project#PropertyName} for either of them I get 'Invalid OAuth2 parameters:Client Identification is empty". What am I missing?

I'm using ReadyApi 3.20.0