iOS 14.5.1 seems to have fixed the issue for some
if you can, update your iPhone/iPad to 14.5.1
I also deleted my fb app and tried to connect through the web browser and it still wouldn’t work. I feel like it’s an issue on Facebooks end for sure, but it’s frustrating. I finally figured out how to bypass the login to get to my game, but I just don’t have access to neighbors. Which is extremely frustrating.
I searched on every forum on internet and eventually end up fixing this by viewing your username on the Facebook app for iPhone is a little different from finding your profile URL. Here's how to do it:-
1. Open the Facebook app on your iPhone.
2. Tap the menu icon (three horizontal lines) in the bottom right corner.
3. Scroll down and tap Settings & Privacy.
4. Then, tap Settings.
5. Now, navigate to Accounts Center (it might be at the bottom under "Meta" or near the top of the Settings screen).
6. If you have multiple accounts linked to Accounts Center, tap on your Facebook profile you want to see the username for.
7. Under your profile information, you should see an option labeled Username. Here, you'll find your unique Facebook username.
More details assistance below.
https://www.youtube.com/watch?v=Kz6j6SyB2YM&ab_channel=TheGeekPage
