Opel Astra H open windows with key

I have an Opel Astra H Caravan from 2004 and a few months ago I could open and close my window with the remote key by holding down either open or close

But for the last like.. half year or year I cannot do this anymore

Idk if its relevant but I had to get an new battery about half-one year ago

Ive seen if you open and hold, close and hold each windows button for 15sec you can „reactivate“ it but nothing worked

Does anyone know how to activate it again cause I need that in the summer

I dont have any OBD stuff here at home (do I need any if so, what?)

Thanks :)