@BB_2020 Did you have your landline number and PKK (Personal 4 digit number) Than you can register your number. The error message look like from a Prospective customer account. Logout and create a new mein o2 Account.

https://login.o2online.de/idm/#/registrieren/start

Hello @BB_2020 and welcome to our o2 community :-)

How does it look like now? Did the tipp that @Joe Doe gave help? Were you able to register and access your Mein o2 area in the online portal now? :-)

Please try opening it up in an inkognito tab, if you still encounter error messages :-)

Regards,

Lars

Hello,

I am going to try to make a new account. However, I don't have a PKK yet. It is not mentioned in the contract from O2, neither anywhere else. Perhaps the reason is that I have ordered the subscription through another website. 
I have requested to send a new PKK per mail.

By the way, my current account has worked before, I was able to follow the status of my DSL order, before the line was made active.

Regards,

BB_2020

@BB_2020 

the PKK is on its way and should arrive within the next days.

Greetings

@o2_Manga Thanks, I have received it and succesfully made a new account that works.