Siemens EQ 9 S700 Connect plus

Hello,

I have been the owner of a Siemens EQ Connect Plus for two weeks.
Trying to connect the machine to my network for two weeks. No chance.

The HomeConnect app can't find a network. Neither mine, nor the other 10 in my area.

I have a Fritz Box 7590, I have already made a lot of settings on my FRITZ!Box.
Changed SSID name, changed password, disabled 5 GHz, 2.4 and 5 GHz different SSID, removed the repeater, disabled my network and created a hotspot with my phone. No chance, the app can't find a network ( yes, is visible )

My brother has the same machine and no problems

.

Then took my machine under my arm and tried it there. The app shows 10 different networks. So that's where I would have gotten it on the network....

Does anyone have any idea how I can get the machine on my network and use the HomeConnect app?