Problem to update my iphone. Is been with update request since last Wednesday

Hello. Try closing the Settings app and checking for the update again. If the issue persists, restart your iPhone. If neither of these helps, it may be best to connect your iPhone to your computer and update it manually that way. Steps on how to update your iPhone with your computer are provided here.

Restart your iPhone, then go to software update, then tap on iOS 15 near the bottom. 14.8 is no longer supported.

Restart - https://support.apple.com/en-us/HT201559