Welcome to the group! To use OSM maps on Garmin, the maps must be converted into a format that Garmin accepts. I have not done this myself, but found some instructions about tools that can do this here: https://wiki.openstreetmap.org/wiki/OSM_Map_On_Garmin
If you have more questions, there is a bigger OSM group here: t.me/OpenStreetMapOrg Maybe somebody there has experience with getting OSM maps onto their Garmin device.
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