If you are with a German colleague who bought the ticket, then it will be fine. The weekend ticket he bought can bring people, don’t worry (make sure he bought a multi-person weekend ticket and not a single-person weekend ticket)

If you are going by yourself, have you got the ticket? ? If you get it, look to see if there is a name on it.

If not, then no problem. Sign your name, be sure to write it (the same as your passport is fine)

If there is the name of your German colleague, it will be a bit troublesome.

Germany weekend tickets are for unlimited train rides within a specified time. In order to prevent someone from buying the ticket and then reselling it, the signature rule was introduced.

Of course, even if you do encounter it, explain it to the ticket inspector decisively in English. Many ticket inspectors speak less than ideal English. If you have legal documents, they may just tell you to pay attention next time.

Good luck