No, I thought so as well. I read up on it and saw that Meraki sentry enrolment splash auth should be disabled. So I disabled it, but no feedback yet (no news is good news right?) Will wait and see what happens. But I don't see how that would solve the issue.
Do you think it might be because we use SCEP in all of our offices, so every office assigns every device a different cert, then the device does not know which one to auth with?