Exam can't access my camera

When I tried to attend my demo test today it says camera access was denied.
it didn’t even ask for access. I enabled my camera permission in settings and other apps can access my camera just fine.

I have the pHtest tomorrow at 10 am pls respond asap. if the issue is not fixed I request a reschedule of the test. if it’s not possible just give me a refund i will apply again after the issue is resolved.