@kenshin Found it.

When manually downloading and isntalling the driver from the TP Link website, some app or service installs called "CSR Harmony" something. This effectively is now the prioritized way of trying to load the UB400 (that's why it loads it under "Other devices" with a CSR_ name, and that all fails. Don't ask me why but basically it gets in the way of plug and play. You have to remove this app/service manually ("Add or remove program" > CSR Harmony) and plug and play will work fine again.

@kenshin Had the same issue solution was to reinstall/install the driver for the ub400 for windows 7 regardless that i am using windows 10 and then search up the program in add or remove programs to uninstall it and it automatically reinstalled the plug and play drivers that seemed to be missing.(Just putting this here incase anyone else needs it took me a day of troubleshooting to solve)

@Lo averigué contanos de que forma lo resolviste. Estoy teniendo el mismo problemas que comentaron al principio. Dado que el adaptador se empareja al mando de la PS4 y funciono 3 dias no se que ocurrio si fue una actualizacion de Windows 10 que dejo de conectarse y ademas los drivers migraron queda con un triangulito amarillo en el Administrador de Dispositivos y al actualizar controladores no existe....intente bajar el Harmony y no aparece mas la palabra DONGLE y el dibujo del adaptador aparece un auricular y dice error de controlador....como puede pasar esto?

@FiguredItOut OMG I'm so grateful I made an account just to thank you. The method I usually used stopped working and this worked for me. I had to install the harmony drivers, uninstall them (by the method you said), wait a few seconds, unplug the adapter and THEN plug it back in. BIG BIG thank you dude, lifesaver. 

@rubthefumo34 yessss i agree. it woked for me.