The below error indicates issues with the Windows TAP adapter, Have you tried re-installing the TAP driver?
2022-08-10 13:21:44.521 +09:00 [DBG] CM processsing: >FATAL:All TAP-Windows adapters on this system are currently in use.
See below reference, please note this is external link so can not vouch for the solution but you can give it a try. As such, this is not AWS ClientVPN issue but rather Windows TAP issue so this would be out of scope for even support to troubleshoot.
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