Unable to turn on notifications for Facebook on iPhone 13 Pro since a week

I've requested that it be edited.

"Is there a way to edit this post? I should have said i can no longer turn on these notifications as of a week ago. I can do it on my laptop but no longer on my IPhone either through website or on app."

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Perform a Force Restart:

Go Here: Force restart iPhone - Apple Support

There are two places to check for notification settings.

1. In the Facebook app directly. Tap the Menu button at the bottom right. Then tap the Settings icon at the top. Go down to Notifications and choose how you'd like to be notified for the categories listed.
2. Open the Settings App on your iPhone and tap Notifications. Look for Facebook and Choose how you want to be notified.

"How do I turn on notifications for Facebook on iPhone 13 Pro?"

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Turning On Notification Selectively for an App (Facebook):

1. Go to: Settings
2. Tap: Notifications
3. Tap: Facebook
4. Turn ON: Allow Notifications

Find Out More Here: Change Notification Settings on iPhone - Apple Support