TP-Link archer VR900V User Manual page 137

To solve this problem, you can set a different USB access username or make the USB
access password the same as your Windows account. After you modify the access
account, remember to log off (sigh out) from the Windows.
T11 Why am I never required to enter the account information for USB
access even though I have enabled the Authentication feature?
This situation probably happens on your Windows computer due to its special
credential mechanism. If your USB access username and password are both the same
as your Windows account, the Windows will automatically use its account information
to access the USB disk. Therefore, you will have no need to enter the username and
password.
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