How do I share "My Location" (on my iPhone) with my wife's iPhone "Find My" App

I left my iPhone home today but wasn't certain if I did that or lost it. We tried "Find My" on my wife's iPhone and got the message the my iPhone was "Not sharing location . Online". Her phone could do the "Play Sound" on my iPhone but not show my location. We waited until we were home to try the sound and it worked.

What do I need to configure on my iPhone to be able to use her iPhone "Find My" app to actually show my location so I know where I left my iPhone?

Her phone is set up where I can see her iPhone location on my "Find My". Looking at the set up on both phones, I can't tell what is different.