meraki mx status of switch is grey unless i access it it will turn to green

[Abechara]

why my green status on meraki client for a switch in the network is grey or offline unless i access the switch, please note that the old configuration was on vlan 1 and it was working fine, i deleted vlan 1 i created vlan 10 and 250 vlan 10 configured as native, vlan 250 management so on the switch i configured interfave vlan 250 with ip address  

config on meraki native vlan 10, allow vlan all

on switch switchport native vlan 10 

                 switchport trunk allowed all vlan

                 switchport mode trunk 

switch is CBS 250 

[GreenMan]

CBS 250 cannot be monitored or managed by the Meraki Dashboard, so I'm not sure what you're indicating here.   Can you provide a screenshot or two?

[Abechara]

if you ping them the status is green if not it is grey as offline

[RaphaelL]

These "clients" ( your switches ) do not produce enough trafic to be considered "online" clients. 

[GreenMan]

OK - that is the Network-wide > clients page, right?   And the Meraki device on that Network is an MX?  My guess would be that maybe they don't generate any interesting traffic otherwise.

While many / most devices would probably appear as a client in the Dashboard if they are routing traffic through the MX, a switch - particularly one not setup for management - is not a client in the same way as a PC, a smartphone etc.   Have you tried running packet captures on the LAN side of the MX, filtered for the switch MAC, to see what traffic (if any) it is generating?