Push Notifications Not Working After iOS Update

Since the last iOS update on my iPhone 13, push notifications have stopped working for certain apps, including Messenger, Facebook, Instagram, and Google. However, I still receive notifications from some other apps.

I have already tried the following troubleshooting steps:

• Checked and enabled notification settings for each affected app
• Verified that Focus Mode / Do Not Disturb is off
• Ensured Background App Refresh is enabled
• Turned off Low Power Mode
• Restarted my iPhone multiple times
• Checked app permissions
• Updated all apps and iOS to the latest version
• Deleted and reinstalled the affected apps
• Reset all settings

Despite these efforts, I am still not receiving notifications for these apps. Could you please assist me in resolving this issue?