Can't see the Hotspot of my phone

I’m running a Raspberry 3B with Volumio 2.882

Volumio cannot see the Hotspot of my phone ( Readmi 8 Pro) in the wireless list. My Tablet and Laptop does.
Volumio cann connect to my wireless network
does anyone have an idea?

Are you sure that your hotspot is 2.5GHz wifi? RPi3B only supports 802.11n.

Thanks for the hint. My Hotspot is 5GHz.

It seems to me very complicated to change this to 2.4GHz, or to find compatible usb Wlan adapter for my Pi supporting 5GHz.

Thanks again