There’s no Mitzvah to eat Matzah on Pesach Sheni.
But rather on the evening of Iyyor 15th at time when Korban Pesach Shenie was being consumed with Matzo & Morror.
In addition, it is very praiseworthy to read thru Shelishi of Beha’alosecho = Kerias haToroh of Shishi Shel Pesach [1st 3 Aliyas of that day’s Kerias haToroh] during afternoon hours of Pessach Shenie.