@hdeet
Hello, can you please verify what is the current driver version for the T2U Plus as below:
https://www.tp-link.com/support/faq/2722/
You are suggested to check if there are multiple drivers on the Windows 10 for the T2U Plus, if there are, remove all the other drivers (go to Device Manager -> right-click the Adapter -> Properties -> Driver Version -> choose Uninstall.) and only leave the latest one, or you can remove all and install the driver manually as this:
https://www.tp-link.com/support/faq/920/
BTW, here is the latest public driver for the T2U Plus:
https://static.tp-link.com/2020/202006/20200601/00015960-RTLWlanU_WindowsDriver_1030.38.0712.2019_Drv_3.00.0032.L.zip
May I know what is the model number of the wireless router? If the above doesn't help, it is suggested to modify the wireless settings on the router, change different 5ghz wireless channel to 36/40/44/48, change its channel width to 40MHz, then reconnect to the network to confirm.