How to disable Login Challenges:

Google has very strict security and privacy policies. If as a user or an administrator you’re trying to login to a particular user account, it will prompt for OTP cause of the 2 step verification set on your account.

If you want to disable the login challenge for some time, you can do the same by the Admin Console:

1. Log in to the Admin Console
2. Go to the particular user ID for whom you want to disable the login challenge.
3. Click on Security
4. Scroll down and go to Login Challenges
5. Click on the edit option on the right side
6. Click on Turn Off For 10 minutes