What product did you use for the onboarding?
What is the client type/OS? Win 10? Win 11? Other?
The message tells that Windows can't access the client certificate. It may be that a different SSID was configured (if using ClearPass Onboard; must be exact match in the SSID name, including case-sensitive; so Corporate Wifi vs Corporate WiFi will not work).
Does it work for other clients/operating system?
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Herman Robers
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If you have urgent issues, always contact your HPE Aruba Networking partner, distributor, or Aruba TAC Support. Check
https://www.arubanetworks.com/support-services/contact-support/ for how to contact HPE Aruba Networking TAC. Any opinions expressed here are solely my own and not necessarily that of Hewlett Packard Enterprise or HPE Aruba Networking.
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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