the device shows Warzone v4.19.3,
4.20 is out now, please update to it. I should have mentioned that in my previous post. If you do that, then uncheck the box, it should work. Please contact me at Help -> Contact -> Report a Bug if it does not.
Is there a problem with using a fake email?
It has no relevance to the question asked here. Email notifications and push notifications are entirely separate, and using a fake email won't affect your push notifications at all.
And yes, there are problems with using a fake email. If you forget your password, your account will be lost forever since the "forgot my password" system depends on you being able to receive an email at your account. Also, if you use an address that belongs to someone else, they can reset your password and take your account over. This has actually happened to people before and they've lost their account.
And even if you're trying to stop email notifications, using a fake email is not a good solution since it wastes Warzone resources in sending emails to an address they will never be received at. It's better to simply uncheck the box in settings so no email is sent.
Edited 6/11/2019 00:23:31