Have you done this?:-
Select the Start button, then select Settings then Network & Internet then Mobile hotspot.
For 'Share my Internet connection from', select the Internet connection you want to share.
Select Edit then enter a new network name and password and click Save.
Turn on Share my Internet connection with other devices.
To connect on the other device, go to the Wi-Fi settings on that device, find your network name, select it, enter the password, and then connect.