Hello miki282,
For difficulties with Personal Hotspot, you'll want to take the steps below:
Use these steps first
Try connecting to Personal Hotspot again after each step.
1. Check that Personal Hotspot is turned on in Settings > Personal Hotspot. If you can't find or turn on Personal Hotspot, check that your wireless carrier enabled it and that your wireless plan supports it.
2. Restart the iPhone or iPad that provides Personal Hotspot and the other device that needs to connect to Personal Hotspot.
3. Make sure that you have the latest version of iOS or iPadOS.
4. On the iPhone or iPad that provides Personal Hotspot, go to Settings > General > Transfer or Reset [Device] > Reset, then tap Reset Network Settings. This also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you've used before.
Use the following steps for more help with Personal Hotspot over Wi-Fi or USB.
• Personal Hotspot with Wi-Fi
• Personal Hotspot with USB
If you can't connect to Personal Hotspot with Wi-Fi
On the device that provides Personal Hotspot, go to Settings > Personal Hotspot, then:
1. Make sure that Allow Others to Join is on.
2. Remember the device's Wi-Fi network name and password that appear on this screen. If you want to change the Wi-Fi network name, learn how to change your device name.
3. If you're using an iPhone 12 model or later, iPad Pro 11-inch (3rd generation or later), iPad Pro 12.9-inch (5th generation or later), or iPad mini (6th generation), turn on Maximize Compatibility.* Then try connecting your devices again to your Personal Hotspot.
4. Stay on this screen until you connect your other device to the Wi-Fi network.
On the device that needs to connect to Personal Hotspot:
1. Turn Wi-Fi off and back on.
2. Make sure that you connect to the correct Wi-Fi network. The network name is the same as the iOS device that provides Personal Hotspot and the Personal Hotspot icon
might appear next to it.
3. If you see a password error when you try to join Personal Hotspot, check the Wi-Fi password: On the device that provides Personal Hotspot, go to Settings > Personal Hotspot to see the Wi-Fi password.
* When you turn on Maximize Compatibility, internet performance and Wi-Fi security might be reduced for devices connected to the hotspot.
You can also find those steps in this resource: If Personal Hotspot is not working on your iPhone or iPad (Wi-Fi + Cellular) - Apple Support
Should that still persist, you'll want to reach out to Apple Support: Apple Support They'll be in the best position to look into this further.
Take care.