One more thing to check is if the router's class name in the production config is correct.

Hi @Daniel Kutac - 

For modern versions, you'll need to change this line in Web.OAUTH2.Google2N:

w jsonObject.$toJSON()

to

w jsonObject.%ToJSON()

because we're now returning a %DynamicAbstractObject

Hi Matthew - 

Have you tried:

set credentials = ##class(Ens.Config.Credentials).%OpenId(..Adapter.Credentials)

Then you can use:

credentials.Username and credentials.Password.

But there's no domain, sorry.