Global variable as authentication URL

Hello,
I’m trying to use a global variable as the authentication URL in a custom authentication service. Is there a way to do this? It would show a “Callback URL is invalid” when using the global variable. pass_global_variable_to_authentication_URL

@dionessa.biton Support for accessing the global variables at Auth URL of custom authentication service type is not available as of now. Please provide your authentication URL along with the protocol in the below format and let us know if you face any further issues.

https://www.customauthentication.com