Samsung Messages RCS issues

[Adi0]

 

Hi, why can't I make my SIM 1 default for RCS chats? It only wants to use the SIM 2, I have no option to choose. 

[Reylob]

Are you sure your messages are not sent as SMS/MMS or via Wi-Fi?  RCS needs data from either mobile data or Wi-Fi and mobile data can only be active on one SIM.

[Adi0]

Yes I'm sure, if works on mobile data of the SIM 2 even tho SIM 1 is set as the RCS number and works on Wi-Fi at home