25F2ACC2-874C-11E9-9AD1-764C6F05B595._domainkey.hospital.uncu.edu.ar AXFR zone transfer

Not an apex domain The domain 25F2ACC2-874C-11E9-9AD1-764C6F05B595._domainkey.hospital.uncu.edu.ar is not the root of its zone.
Instead, try zone transfer on hospital.uncu.edu.ar .