i cant login my facebook account with iphone 13, but i can login my facebook account with my ipad.

I had this problem too. I read many posts about this issue, tried various workarounds, and found a method that worked for me. Maybe you can try it:

1. Completely delete the Facebook and Messenger apps.
2. Backup your device (which doesn't have Facebook and Messenger).
3. Restore your device to factory settings.
4. Go through the welcome screen without signing in with your Apple ID.
5. Once you reach the homepage, use a different Apple ID to sign in to the App Store and download the Facebook and Messenger apps.
6. Log in to your Facebook account. (This worked for me.)
7. After that, you can sign in with your real Apple ID and iCloud.

Before attempting the above method, I recommend that you simply delete these apps, log in with a different Apple ID, re-download the apps, and try logging in to your Facebook account first. I didn't try this because the above method worked for me, but I think logging in with another Apple ID without resetting to factory settings might work too. It's not too hard to try it first.

Alantienern wrote:

i cant login my facebook account with iphone 13, but i can login my facebook account with my ipad.

Ads manager, meta business suites, facebook apps all cannot login with my iphone 13

Report the issue to Meta or look at their help site, not an Apple or iphone issue.