This subject is interesting and exposes the mindset of the organization.
Elders who conducted marriage ceremonies always make a big deal about getting the couple to sign their license immediately after they are married. They stress over this because they are afraid the couple will sneak off for a post wedding ceremony quickie.
The bottom line is - you're not married until the earthly authorities say you are.
This makes no sense. When I got married the elder droned on for 20 minutes about how marriage is God's arrangement and it is a gift from God. Which is it?
What if you're married in a country that has no marriage license and then move to one that does? The organization says you have to get a marriage license or else!