We have connected the meraki MR 52 access points to MS 250 switch.
When we tried to make switch port to trunk, access points will be go unreachable.
Is the AP configured to user a specific VLAN for management, or has it been left untagged? If configured for a specific VLAN - what?
The trunk port - what native VLAN is it using?
You say it was working, implying it worked when the switch port was an access port. What VLAN was the access port in?
What VLAN do you want the AP to use for its management traffic? Is the AP using DHCP and is there a DHCP server in that VLAN? Does the AP get an IP address according to the DHCP server?