New [RedmiK20P 9.12.12] no Internet with hotspot

[lianyanjiajia]

My Surface Go doesn't have internet with hotspot on my K20Pro.
But my redmi note4 pro can use internet with hotspot on my K20Pro.
My system version is MIUI 11.1 9.12.12.
Also,It's no problem on the MIUI 10

 

[LOLO9393]

My Surface Go doesn't have internet with hotspot on my K20Pro.
But my redmi note4 pro can use internet with hotspot on my K20Pro.
My system version is MIUI 11.1 9.12.12.
Also,It's no problem on the MIUI 10

What frequency band 5 Ghz or 2.4?
We had trouble with the 5 Ghz band last 2 weeks.

 

[lianyanjiajia]

What frequency band 5 Ghz or 2.4?
We had trouble with the 5 Ghz band last 2 weeks.

I try it both.2.4g and 5g both can't use the internet.