Router reset. Not successful registration

Hello. Coming back home After 1 week holidays, I found my internet connection not working. The internet button of the router was Red and blinking. I restarted and then reset the router several times. After reset, the button info on the router became red. Then going to o2.box website, the Page O2 homebox einrichtung appeared, as in the attached screenshot. Clicking on weiter, in the following Page, I was asked to insert a kennwort. I suppose I Need to create a new password After the reset. however After doing this, always following the rules for password creation, the last screenshot appeared (anmeldung nicht erfolgreich). I tried to use also the old WLAN password on the back of the router or Mein O2 website password. Whatever Is the choice, always the same error message appears. I did not have any possibility to insert the Voip-PiN, as the procedure failed at the kennwort entry. Anyone can suggest what to do? i Need urgently to fix the issue as I Need the WLAN for the home office.

Thanks and Best Regards,

Massimo

Edit o2_Larissa: moved to English o2 Community: Broadband / DSL