Same same, different here and there but same. Daughters on iThingys and me on a S20 and now back on S8 temporarily I noticed they can now see my location but I still can't see them. I did see their location for a couple hours since completing the transfer to S8 but then it vanished again.
WE ARE IN MAY ALREADY!!!
Agreed It is now mid-May of 2023 and this problem persists. I have verified location settings on my children's devices along with location permissions for Microsoft Family Safety, and still I show location unavailable.
I have reinstalled the app on my device which has worked for a short while in the past but now that no longer seems to correct the issue. Microsoft Family Safety does a fantastic job at application and web filtering but anything relating to location is non-functioning. I have share drive and location enabled on my device with my wife and she can't even see that.
I went under my settings and attempted to add a place. I began entering the street address and it found it I selected it and named it when I went to save it, I'm presented with a message that it cannot find this place.
After reading of others' similar problems, issue appears to be related to the newest version of Android which I'm sure this is due to some Google shenanigans. Regardless locations is working for other apps.
Fortunately I also use Google's family link. It's application and web safety isnt nearly as good as Microsoft Family Safety, but at least I can find the location of my children.
I'm sure this will eventually get fixed but for now it is not, and I and others are going to continue being squeaky Wheels until this gets fixed. Expecting a feature work in a product, that you are paying for, is not an unreasonable request!