I can't use my tablet as a personal hotspot
Check the password for the hotspot on your tablet and key in the correct password on the other device.
Can you use your tablet's internet connection?
It's important to find out if you can use your tablet's internet connection. If you can't use your tablet's internet connection, you need to solve this problem first. When the problem is solved, you will most likely also be able to use your tablet as a personal hotspot.