I do not have this problem with my 5GHz WiFi connection. Please check for any settings that may be hindering your devices 5GHz capabilities.
Also, do you just get an error when you click on a 5GHz network, or can you just not find them at all?
is anybody else having problems connecting to a 5ghz wi fi network on a galaxy s10
Try to change your 5 GHz channel on your router from 'auto' to something higher than 100 or choose the highest.
Works for me.
On your Router.
I don't use Galaxy 10, but in my case, my 5ghz SSID can be found on some devices but not on the others (all devices have dual channels wifi capabilities). This might be same problem as yours.
I use D-link DR-878 Router, i set Channel 11 for 2.4ghz even though 'auto' works just fine.
But i can't set 'auto' for 5ghz, for some devices can find the SSID when the others can't.
So i had to try every channel until it can be found on every dual channel devices, and looks like the highest channel do the best, which is channel 165 on my DIR-878.
Hope this will solve the problem.
Does your Galaxy 10 find the 5ghz SSID but can't connect to or the 5ghz SSID can't be found at all?