Cerx Calling USSD code ##4636## and then enable DSDS doesnt work from my country/provider.
The code is *#*#4636#*#*. What is meant by "doesn't work"? What happens when that code is dialed? This should not work differently by country or provider.
Cerx I activated Gservices, Esim, and when I try to add an eSim it doesn't open a camera to scan the QR code (which is all i have).
What does happen when the "Add SIM" button is pressed? In general it is much more helpful to report what happens, as opposed to "doesn't work".
Has the GrapheneOS Camera app been disabled? Does it work OK when launched?
Edit: on my device, with DSDS on, if eSIM management is on then the "Add SIM" button pops up a QR scanner, and if eSIM management is off then the button flashes but does nothing else. This is in the owner profile with no changes having been made to Camera or other system apps.
Also: is some other camera app installed? If so, which?