I and a couple of others in this forum have the same problem. I have an ongoing ticket with them and they have never acknowledged the problem but have offered me a buy back option, I've filled all the forms out and emailed them but have no acknowledgement that they recieved them other then before I emailed them they did say there was no point in sending the card to them due to no one being in the office due to the lockdown.
I firmly believe that the firmware on the card is now nolonger compatable with 20H2, I've given up on the card and running on the onboard soundcard.
Like you my card can take up to an hour to be detected, this is definitely a Asus problem but going on how long it took them to acknowledge the digital licence problem and fixing it I wouldn't hold your breath.