If you cannot get in contact with Asus support, try posting a question on the Asus motherboard forum, indicating you have an AMD processor, your motherboard model and cannot see the drive to install Windows onto, someone on that forum would have the same motherboard model as you have and may be able to provide oyu with a working method for that motherboard.
https://rog-forum.asus.com/t5/other-motherboard...
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