@Solla-topee Now im frustrated I have rebuild network I remove m9plus v1 from the setup and put x90 as router witch enable the iot feuture. So now wifi work and iot work everywhere but guest network...

@Solla-topee Now i have tried to change the swtich to an tp-sg108 Its the same problem as above. So its not the switch

@Solla-topee Network ssid guest appears but i cant connect in appartment (wired backhaul) Another example: when im in the main house and i am connected to guest network and go out to the appartment...

@Solla-topee 1. Yes Main house : M9 plus as main router in basemnent guest work x95 wireless livingroom guest network work X95 wiered second floor guest network dont work here X90 wired first floor...

@Solla-topee Map picture

@Solla-topee it looks like this Internet-> router (deco m9) -> switch in port: uplink nr 2 (i have tried port1 also no diffrence)(sg1210p) -> 3x enthernet decos 1x wifi deco See picture Guest network...