Hi,
Did you checked this article and followed the steps? Do you enrol in 10 seconds after plugging in? As per the article "Please note that as per Microsoft's requirement "FIDO2 reset commands are only valid in the first 10 seconds of one power cycle". While this is well documented in the FIDO2 manufacturer guide, this was not made evident for end-users in the UI of the current Windows 10 Control Panel. So, if during the reset operation you get an error, please redo the operation and try to complete the reset within 10 seconds after you plugged the key to USB.
passwordless-authentication-in-azure-ad-with-token2-fido2-keys
Hope this helps.
JS
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