Could your issue be that you have multiple certificates installed on the client, one from AD and one from Intune, and the client is selecting the wrong certificate during the authentication (the AD one instead of the Intune one)?
If that is the case, in your supplicant configuration you can change simple certificate selection to one issued by a specific CA:

And, make sure that the certificate issued through Intune has the Intune DeviceID as the Subject-CN, which is not the default.
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Herman Robers
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If you have urgent issues, always contact your Aruba partner, distributor, or Aruba TAC Support. Check
https://www.arubanetworks.com/support-services/contact-support/ for how to contact Aruba TAC. Any opinions expressed here are solely my own and not necessarily that of Hewlett Packard Enterprise or Aruba Networks.
In case your problem is solved, please invest the time to post a follow-up with the information on how you solved it. Others can benefit from that.
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