Have same Qualcomm driver for QCA9377 on my XPS 8930, and it can connect on either 2.4 or 5 GHz. No offense, but sure you enter the right key for the 5 GHz network? It may not be the same key as for your 2.4 GHz network. Does the PC list the SSID (name) of your 5 GHz network on the Windows Network & Internet>WiFi screen when you click "Show available networks"? (I see both SSIDs listed, even when not connected to either of them, eg while using Ethernet.) Have you tried to add the SSID for your 5 GHz network when you click "Manage known networks" on that same WiFi screen? Have you checked the router's settings to make sure it's set to allow new connections on 5 GHz? Have you rebooted the router? EDIT: And keep in mind that while 5 GHz WiFi is faster than 2.4 GHz WiFi, 5 GHz has a shorter range. So is the XPS 8930 just too far from the router to use 5 GHz?
My XPS 8930 will not connect to my 5GHz Wi-fi.  It connects to 2.4GHz with no problems.  The adapter is listed as a Qualcomm QCA9377.  The driver version is 12.0.0.1118 dated 5/19/2021.  When I click on "Connect" for the 5GHz, I'm asked to "Enter the Network Security Key".  When I enter the key, the system goes into "verifying and connecting" for 10-15 seconds and then says "can't connect to this network". Other computers (specifically a Dell laptop) connect to the 5GHz with no problem. Suggestions?  Thanks for the help.
XPS 8930, Qualcomm QCA 9377 won't connect to 5GHz Wi-fi