Notification message stuck on screen

 Try and Force Restart your iPhone EXACTLY as shown below and see whether that resolves the issue:

• Press and quickly release Volume UP button
• Press and quickly release Volume DOWN button
• Press and Hold the SIDE button until an Apple logo appears and then release the Side button (Can take up to 20 seconds. (DO NOT release Side Button when invited to Slide Power OFF). 

Axel F.

kripa98 Said:

"Notification message stuck on screen: Message from app to send notifications - Allow or Don't Allow. Unable to click on either & cannot reboot the phone"

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Troubleshooting a Frozen iPhone:

A. Start with a Force Restart:

Go Here: Force Restart iPhone - Apple Support

B. Try the Tips at these Apple Support Links:

• If your iPhone is Stuck on the Apple Logo - Apple Support

• If the Screen isn’t Working on your iPhone or iPad - Apple Support

• If your iPhone Won't Turn On or is Frozen - Apple Support

• If you Need More Help - iPhone - Apple Support