Unable to register my account for home internet

I’ve recently taken an O2 HomeSpot contract. In order to check / manage the invoices, I’m trying to create an account. I was able to give PKK, valid username, valid password but still the registration process is never successful. I always end with error message “This service is not available please try again later”. Could anyone help me to check my invoices with/without creating an account? 

Edit 20.09.2023 15:08 o2_Katja: moved from o2 my Home Rechnung