Hotspot
My iPhone SE hotspot will not connect to my MacBook Pro! I have reset and updated everything but my hotspot still will not work! Please help!!!
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Has it ever worked with that SIM? If not then check with your SIM provider that tethering is included in the contract.
Keep the hotspot window open while connecting. If the Mac and the SE are on the same AppleID it should connect without even a password.
Have you tried connecting by USB?
Hotspot problems
How to set up a Personal Hotspot on your iPhone or iPad - Apple Support
and
If Personal Hotspot is not working on your iPhone or iPad (Wi-Fi + Cellular) - Apple Support