Cross mode systems and reflectors are becoming more common and it’s wise to be registered on them all so your callsign will display correctly to everyone.
DMR: https://www.radioid.net/register
D-Star:
https://regist.dstargateway.org/instructions
https://regist.dstargateway.org
Registration Check: https://wb1gof.dstargateway.org/cgi-bin/dstar-regcheck
NXDN: https://www.radioid.net/register/nxdn