Check this post: "You could try turning on IPM, but an AP-315 will not have any relevant restrictions even when it's on 802.3af with IPM off (USB is off and max power on 2.4GHz is reduced by 3dB; that should not affect connectivity)."
Enabling IPM and LLDP-MED may solve your issue.
------------------------------
Herman Robers
------------------------
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.
------------------------------