Hi Maria Elena Pezoa,
Some registered data stores including raster stores, an ArcGIS Data Store tile cache, and spatiotemporal big data stores cannot be validated in ArcGIS Server Manager at this time. Their status will always be unknown when viewed in Manager, and a question mark (?) will appear in the Status column.
Maria Elena Pezoa, is this still true in 10.7? I'm seeing the same behavior described in this thread in a new 10.7.1 installation. The link you sent is from 10.6 documentation and the note regarding the inability to validate raster data stores has been removed in the 10.7 documentation. Just want to make sure this is still expected behavior in 10.7. Thanks!