If the PIP mode on your YouTube account is not functioning. Then, this blog provides comprehensive instructions on how to resolve YouTube picture in picture (PiP) Mode issues for iPhone and Android smartphones.
1. Enable PiP in device settings on Andriod.
a) Go to Settings then Apps & notifications.
b) Tap on Advanced and choose Special app access.
c) Select the picture in picture option and make sure the toggle for YouTube is on.
2. Enable PiP in the YouTube app on iPhone.
a) Open the YouTube app and tap your profile picture.
b) Go to Settings then General.
c) Make sure picture in picture is switched on.
3. Update the YouTube app and your device software.
4. Restart your phone.
5. If you’re still having trouble, contact YouTube support.