@Hobnobs2 

Does it see the 5G signal of the Samsung Note 10+ 5ghz hotspot or not? If it cannot even see that network, I'm afraid it works on a different channel with that on the phone hotspot, as far as I know, there is no way to change the channel on the phone hotspot, so they may not be compatible.

While if you can see the 5G signal but cannot connect to it, you may show us the error message when you try to connect to it, whether it shows an incorrect password or any other message, if it shows an incorrect password error, try to change the wireless password on the phone hotspot, reboot the phone and the computer to confirm.