PMP450b wont connect to cnMaestro(cloud)

I have multiple 450b’s connecting to a 450i which will not show on cnmaestro. It registered with the AP using ICC and i have set the color code and it registered after a reboot. I can ping cloud.cambiumnetworks.com. All the firmwares are the same across the devices at the site. I have tried factory resetting and it registered again ok.
I have removed and reclaimed it on cnmaestro. I have put Account Id and onboarding key in.
There are 2-3 of these doing this out of ~500 at the site.

Any ideas?

The log shows
10/30/2020 : 16:44:03 UTC : : Not able to resolve cnmaestro.management.lan , please add dns mapping
10/30/2020 : 16:44:03 UTC : : OpenConnection to cnmaestro.management.lan:443 failed
10/30/2020 : 16:44:03 UTC : : Not able to get cloud details, can’t proceed
10/30/2020 : 16:44:05 UTC : : Binding to local port 65503 failed error = 20
10/30/2020 : 16:44:05 UTC : : Failed to bind/insert socket into wsi
10/30/2020 : 16:44:05 UTC : : Not able to establish connection with cnMaestro
10/30/2020 : 16:45:26 UTC : : callback_websocket: LWS_CALLBACK_CLOSED
10/30/2020 : 16:45:26 UTC : : Attempting (re)connection in 5 seconds

looks like you have a cnMaestro on-premises address in the logs make sure the SM in configuration cnMaestro looks like this