Custom in the studio.
I have a custom domain in my studio. When you try to sign up with a Google account, you will see the attached screen. Where is the problem?
Hey @stephenasuncion check this out 
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I’d like to update you on the current situation. Even when signing up with a different Google account from a different smartphone, the same error continues to occur. This is happening for both of us. The same error appears regardless of which of the two URLs we use. This suggests that it’s not an issue with my domain. Do you have any idea what might be causing the problem? I’d like to release once this issue is resolved.
I understand the reason now.
It seems that browser issues occur when opening with the LINE app. Since LINE has the highest penetration rate in Japan, I was trying to do list collection through LINE. It appears some ingenuity will be necessary.
Hi @avakero,
You are likely correct that the issue is related to using the LINE app. I just tested signing up for your studio with Google using a standard web browser and did not encounter any issues, the signup worked as expected.
Sometimes similar problems can occur when you open a link inside certain apps (like LINE, Snapchat, or Telegram), those apps often use an internal in-app browser that doesn’t meet Google’s security requirements for authentication. This triggers the “Access blocked” or “Use secure browsers” error from Google.
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Thank you. I understand.