Two points:shalom b'SHEM Yah'shua HaMashiachThe so called last supper was truly a Pesach Seder
Pesach is one of YHvH's required feast days.Second :
Matthew 15:24 But He answered and said,
"I was sent only to the lost sheep
of the house of Israel.
As a Messianic Jew, a careful reading and study of the 4 Gospel accounts reveals that in fact, the last supper was just that, supper. It was not a seder of any kind, but what Yeshua was doing was the kiddish, the blessing of the bread and wine that we do every Shabbat. In this account of the kiddish, Yeshua adds greater meaning to the bread and the wine.
See John 6:48-71
Yeshua was the Passover sacrifice, but He is also the bread (manna) and the wine (blood) of the Word. We must be careful not to confuse the two lest one finds themself being deceived when the false one appears!
May you have a blessed Shabbat! Shalom!