The AP 6 Ghz is not started, only 2.4 & 5 is working, with green led lights.The Ap is in a controller/ Conductor env.All settings is by the book, as shown in document online.
Ie: Configuring 6 GHz Radio Profile (arubanetworks.com)
The DTR is 8.10; which is the required one for AP-655.
The Regulatory Domain is the correct country of operation, with valid 6Ghz channels
(Changing it, makes no different)