Denied association (code=12) when connecting to 5GHz WLAN

I'm using the **Archer T2U** as a WLAN adapter on my Debian machine and I cannot connect to my 5GHz home network. I can connect to my 2.4GHz network without any problems. lsusb: Bus 002 Device 002: ID 148f:761a Ralink Technology, Corp. MT7610U ("Archer T2U" 2.4G+5G WLAN Adapter dmesg: [ 86.913331] wlan0: authenticate with XX:XX:XX:XX:XX:XX [ 86.965513] wlan0: send auth to XX:XX:XX:XX:XX:XX (try 1/3) [ 86.966267] wlan0: authenticated [ 86.968872] wlan0: associate with XX:XX:XX:XX:XX:XX (try 1/3) [ 86.969758] wlan0: RX AssocResp from XX:XX:XX:XX:XX:XX (capab=0x511 status=12 aid=11128) [ 86.969759] wlan0: XX:XX:XX:XX:XX:XX denied association (code=12) uname -r: 4.19.0-4-amd64 The 802.11 spec states that the code 12 stands for: >Association denied due to reason outside the scope of this standard and [Cisco's website](https://community.cisco.com/t5/wireless-mobility-documents/802-11-association-status-802-11-deauth-reason-codes/ta-p/3148055) lists this as an example: > Example : When controller receives assoc from an unknown or disabled SSID Is my router causing this issue? I assume it's not the driver since this is a fresh Debian installation and I doubt it's a hardware fault in the adapter since it is relatively new. When using the adapter with a Windows machine it frequently disconnects from the 5GHz network but works flawlessly on the 2.4GHz network.