You should write to support@chess.com. It seems likely that the person who runs the program for titled players would know.
LBX appears to me to be a relatively new organization. (Website said it was celebrating its 9th birthday.) LBX is https://lbx.org.br/
CBX is https://www.cbx.org.br/
Does the MLBX title from the Brazilian Chess League count as an NM title? Since my state has no afiliation with CBX, but with FIDE and LBX, and considere MLBX (Brazilian Master Title) the National Master title, does It count as one here in cc? (its an otb btw)