How to submit PlayStore app access credentials for google sign in authentication?

Solution 1:

You Just need to tell them to "login using Google Account" in "Any other instruction" field, as shown below, you don't have to create a test account for this. I tried this many times before.

Solution 2:

I noticed that you do not need to do this in the case of a Google account.

If you see the pre-launch reports in the Google Play console, and watch the replay of the test, you will see that when the Google Play robot encounters the Google Account login screen, they will have an account with a @cloudtestlabaccounts.com email that they will use to login as seen on the below image:

As you can see, Google Play robots have Google accounts available to them to login and therefore you do not need to put as special access, unless if you are using non-Google accounts to login.

I personally use Google Accounts as login and never submitted any login information and they didn't have any issue with this.