We got Fiber (finally) and bought a Router from "Deutsche Telekom" called "Digitalisierungsbox Premium 2". We have 2 locations (1 = house, 2 = company). Router is located in the house. House and Company are connected via LAN. I bought two TL-WA1201:

My configuration:

AP House:

SSID 1 - Private

SSID 2 - PrivateGuests

AP Company:

SSID 1 - Private

SSID 2 - PrivateGuests

SSID 3 - CompanyCustomers

Everything worked like a charm until I checked on the IP adresses. No matter the SSID everyone is having the same subnet. Which means customers and guests can see other devices on the network. I added the VLAN configuration:

My configuration:

AP House:

SSID 1 - Private - VLAN 1

SSID 2 - PrivateGuests - VLAN 20

AP Company:

SSID 1 - Private - VLAN 1

SSID 2 - PrivateGuests - VLAN 20

SSID 3 - CompanyCustomers - VLAN 30

SSID 1 works fine. I get 192.168.2.x IP adress and I have access to my network + internet.

Reading this AP is multiSSID capable using VLANs, I assumed based on your SSID you having different IP adresses. This seems not to be the case. Since VLAN is activated SSID 2 and 3 is gettting 169.254.x..

The router does not have VLAN functionality.