If an iOS device isn’t sharing their hotspot connection with other devices, even though it used to. You will have to re-calibrate the settings.
- Turn off the personal Hotspot the mobile data
- Restart the device
- Go to settings
- Turn on mobile data
- Turn on Personal hotspot
- Select enable discovery via Wi-Fi and Bluetooth
If the enable discovery notification hasn’t come up still check if the hotspot is now appearing on another device.
The device should now show up under Choose a network in Wi-Fi or under devices in Bluetooth.