OAuth Error: Domain Not Authorized in Firebase for FlutterFlow Test Environment

I'm encountering an issue while testing my app in FlutterFlow. The error message says:
"This domain is not authorized for OAuth operations for your Firebase project. Edit the list of authorized domains from the Firebase console."

I've set up my Firebase project and integrated it with FlutterFlow, but I suspect the issue is related to the test environment's domain. Could anyone guide me on how to add the test environment domain to the list of authorized domains in Firebase?

Any detailed steps or additional tips would be greatly appreciated. Thank you!