I had two stops approved a long time ago, but they aren’t showing up—what’s wrong?
Welcome to the forum 
Probably because they are not used by Pokemon Go due to it’s density/inclusion rules, i.e., blocked by nearby pokestops.
It’s also possible they have been downgraded due to a request from a property owner.
It’s also possible they have been deleted following a removal report.
If you want to provide the coordinates, it should be possible to provide the correct explanation.
The following post explains the density rules which is the most likely…
https://community.wayfarer.nianticlabs.com/t/why-an-accepted-wayspot-may-not-be-used-in-pokemon-go-s2-cells-and-pokemon-go