@Sächsin    You've aske me if I could make your acritical available in the English community.

(I'll do my best. I will have to make your article readable to English speakers hope this is ok)

 
The article in German reads " Die persönliche Kundenkennzahl (PKK) ... was ist das und wie bekomme ich die?"
This means in English The Personal Customer key and how to get it.

This is a very interesting article which deal’s with your ( PKK"Persönliche Kundenkennzahl")  “Personal Customer Code" to make  your self known to customer services. 

This code is critical , for example they would need your code to make changes to your account or to activate your sim.

@Sächsin  writes As a customer of o2, you will inevitably come into contact with the topic "PKK" at some point, Example,. if you call via the hotline or have questions here in the community and are only logged in with a prospective login.
This key number is used to identify the customer to o2 employees.

So, now the question: How do I get to the PKK?

If you are a new customer and order online via the website, you will set the ( PKK ) "Personal Customer Code" yourself in the ordering process.

If you sign the contract in a local O2 shop, you will be able  set this four-digit number there and then. You will find the PKK in your written documents on page 1. If you order by other means such  via a comparison website , then you get the PKK  key   in an e-mail.

Now to the problem with the PKK  "Personal Customer Code" once you have set the number and your an Existing customer.

Sächsin writes:4-digit number help now what to do?

 Existing customers, who sometimes have the problem "lost, PKK forgotten,  Documents are lost when moving etc
You can request your persönliche Kundenkennzahl ( personnel customer pin ) via this link. click

This will open up the document in PDF format.

You can also contact the customer service directly and ask for the PKK to be sent by  postal mail.

 Here is the URL  https://www.o2online.de/kontakt/  

Also you can also get your PKK in an o2 shop. The staff in the shop will have to check your identity with an official ID and then you get the PKK immediately

Direct to @Sächsin German article click here 

Edit: o2_Dennis 16.05.23 / Link aktualisiert