personal hotspot won't connect to internet

Use these steps first

Restart the iPhone or iPad that provides Personal Hotspot and the other device that needs to connect to Personal Hotspot. Make sure that you have the latest version of iOS. On the iPhone or iPad that provides Personal Hotspot, go to Settings > General > Reset, then tap Reset Network Settings.

If Personal Hotspot is not working on your iPhone or iPad (Wi-Fi

The Hotspot is a carrier-specific feature. Contact your carrier, if it is not appearing on your device.

Meanwhile...

Check the following

1. Network coverage and stability
2. Data Balance
3. On your windows (See if WiFi Auto Joins is enabled)
4. Also, check if you have any stronger WiFi signal around your computer.

I tried all the solutions posted online, and I contacted Apple support. Apple support, after easy troubleshooting, told me it's the problem due to carieer. Unfortunately, I later found out that's not the truth.

Coincidentally, I've got an iphone XS and an iphone 13 promax on hand with diffrent version of IOS and different carrier. Basically, it took me 10 minutes to keep switching sim card into different devices, and use different devices(apple and microsoft) to connect two different phones seperately.

The answer is actually fairly simple. You just simply go to setting, general, about, change your device name, and it works.