Just to be clear I would do a hard re-boot ie power off at rear.
deviwiki.com/wiki/TP-LINK_Archer_T2U
https://www.tp-link.com/uk/support/download/archer-t2u/#Driver
CONFIG_RTL8821A = y
Tried that package,no joy.Have you actually tried the enigma2 enigma2-plugin-drivers-network-usb-rtl8812au package?
The TP-Link instructions for building the Linux driver at:
setCode:https://www.tp-link.com/uk/support/download/archer-t2u/#Driver
and it's a USB version, hence the u suffix.Code:CONFIG_RTL8821A = y