Hi,
VLAN was not entered. As I said, MR33 works perfectly on the switch and gets the IP address from the DHCP server.
Yes, DHCP Scope is big enough. I tried two things. One external DHCP server and one DHCP on the switch.
in both cases MR33 works fine and MR42 does not.
I have 4x MR42 and the same problem with all of them. All APs are new and have been supplied by Cisco.
The only difference is the power consumption.
I'll test it in the company tomorrow morning and give you feedback.
AP may not get enough power and cannot boot properly.