I am searching a way how to change the SSID from a Z1 true API. I put the Z1 in a combined Hardware Network. if I read out the SSID from this network true Postman with "https://dashboard.meraki.com/api/v0/networks/L_5950381007663XXXXX/ssids" i get the List of the SSID'd from 0 to 14 but not the one configured true the Menu Teleworker Gateway --> Wireless Settings. Does somebody know if there is a special Post and Get for this SSIDs?
I had not tried that before on a Z1, but just did and I got the same results as you. The same Postman commands worked fine on an MX64W, but not on my Z1. I'd open a ticket with Support and I'll do the same in case this requires an API fix (or addition to support on Z1).
I got the Solution from the Meraki Support Team. The problem was that the Z1 was in a Combined Network. I delete this network an put the Z1 in a Security Devine Network and now it is working perfectly. so if somebody want to manage the Z1 true API it can not be in a Combined Network.