What must a national member federation do to allow a player with two nationalities to compete?

To allow a player with dual nationalities to compete, a national member federation must obtain written certification from the other nationality's federation. This process is important because it ensures that the player’s eligibility is recognized by both federations involved.

Certification establishes that both federations agree on the player’s status and that there are no disputes regarding the player's participation. This is crucial in maintaining integrity within competitions and ensuring fair play, as it prevents players from switching national allegiances without proper communication and agreement between federations.

While various other procedures might be involved in managing player registrations or eligibility checks, obtaining this written certification directly addresses the issue of dual nationality and secures the necessary consent from all parties, making it the correct choice in this scenario.