Sonos Play:1 on dualband wifi with same SSID

Hi,

I recently moved into a furnished apartment that has a dualband WiFi, but the SSID for the 2.4 and 5 GHz is the same (and I cannot change it). Now, I am unable to set up my Sonos Play:1, it just stays in the loop of trying to find the Sonos when I try to set it up. My phone can switch between 2.4 and 5 but even when it’s on 2.4 it cannot set up the Sonos. I now have it wired but this means I have to put the Sonos speaker in the hallway which clearly is not ideal. Even when wired I cannot update the Sonos speaker with the WiFi information.

I have searched the forum and tried some of the suggestions but haven’t been able to find a solution.

Best,

Jeroen