IW6300 / Failed because Vlan Trunking is disabled in the AP /

[mirac]

Hi

I am trying to add some IW6300 AP to mobility express. I add more than 90 devices to Mobility express but last 5 devices shows an error when I trying to change ethetnet mode in the bridging section from Access to Trunk I see error " Failed because Vlan Trunking is disabled in the AP " 

What could be reason fro this?

AP Running Image : 8.10.151.0
Primary Boot Image : 8.10.151.0
Backup Boot Image : 8.10.112.0

[balaji.bandi]

what happends if you remove working 2 or devices and add failed devices is that work  ?

check some FAQ any limitation ?

https://www.cisco.com/c/en/us/solutions/collateral/enterprise-networks/mobility-express/q-and-a-c67-734485.html