Facebook App Login Error *Please Help*

Getting a warning message from Facebook. It says
"Your app doesn’t comply with the following:

Platform Policy 8.1: Verify that you have integrated Login correctly. Your app shouldn’t crash or hang during the testing process.

During Login, your app or website is crashing or hanging excessively, creating a broken experience for people trying to use your Login integration. To make sure this flow runs smoothly, check that you’ve integrated Facebook Login correctly. We recommend that you test Login on all integrations."

When I tried again it now say my App is restricted.

Followed the instructions straight from here: FB Login Implementation in 2019

At a loss for what to do. Please help

I also received same email, some one help me how to communicate with fb team. to know what exact issue they are facing