The phrase "liaison role" means acting as a connection or go-between for different people, groups, or organizations. It involves facilitating communication, coordination, and collaboration among different parties. Full definition
Similar and related words and phrases are presented below.
Ability to continue liaison role with supplier account representatives and contract advisor, procurement buyer role. (members.climber.com)
The supporter liaison role is effectively covered by a number of people within the Club covering the key areas of ticketing, operations, match day experience and communications. (liverpoolfc.com)
I find this really interesting; it is a sort of liaison role and means collecting feedback from colleagues across Europe who are selling and supporting the new instrument and passing it onto the R&D group in the States, and vice versa. (sciencemag.org)