welcome to Wefugees and thanks for your question.
I did some research for you and if I understood correctly, you should have received a supplementary sheet (Zusatzblatt) with your electronic residence permit. There are two types of it: In paper form and in certain cases, the ancillary provisions are stuck into your travel document with a label. All information (ancillary provisions and other requirements for the residence title) is also stored on the chip of the electronic residence title.
(Here is the source of my research (page 14), but unfortunately it is in German only: https://***.bamf.de/SharedDocs/Anlagen/DE/MigrationAufenthalt/ElektronischerAufenthalt/broschuere-eat-a4.pdf?__blob=publicationFile&v=9)
Is there perhaps an additional sticker in your travel document? If not, I would recommend you to contact your local immigration office (Ausländerbehörde) to have a new Zusatzblatt issued. I will also link our dear experts @mbeon-Éanna, @mbeon-Ruth and @mbeon-Christine here. Maybe they can correct me or add more information to my answer.
Please don't hesitate to get back to us with any further questions.
Best wishes, Julia