You should receive an OTP within 2 minutes of entering your mobile number, if:
✅ You’ve entered the correct mobile number
✅ Your network is strong enough and not fluctuating
✅ Your number is not registered for DND
In case you still don't receive the OTP, you might have to check this with your network service provider.
PS: If you’ve logged in using Facebook or Google with the same account/team name earlier, you can use these methods to log in on your Android phone. You won’t need an OTP. 😀