Personal hotspot: iOS 15
My personal hotspot does not work after updating my iPhone 11 Pro to iOS 15. First noticed on Mac where it doesn’t want to connect, but also encounter the same issue with other devices.
iPhone 11 Pro, iOS 15
Try a forced restart of your 11, using these instructions:--> Force restart iPhone – Apple Support
If the issue persists, see this support article:--> If Personal Hotspot is not working on your iPhone or iPad (Wi-Fi + Cellular) - Apple Support
Regards
Giulio