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You may note all of these people were on earth at the time.

The kingdom of heaven was within them, and they all continued with one accord in prayer and supplication. I notice Mary there with them, one holy catholic apostolic church.

They were praying to God.

All prayer is directed to God.

Hail Mary is a request for Mary, Mother of "God with us" to pray to God for someone's benefit. It seems to me that the assertion is that sinners should not ask another to pray to God for them, lest someone misconstrue and be offended.

And when he was demanded of the Pharisees, when the kingdom of God should come, he answered them and said, The kingdom of God cometh not with observation: Neither shall they say, Lo here! or, lo there! for, behold, the kingdom of God is within you.

Luke, Catholic chapter seventeen, Protestant verses twenty to twenty one,
as authorized, but not authored, by King James

HM ismamprayer TO Mary.

Yes, Mary was there. Luke records nothing else about her after this passage. His brothers from Mary were there also. Don't know about the sisters.

The Hail Mary prayer is a prayer TO Mary.

Again, all prayer is directed to God....not created beings.

The examples we have in the NT of believers praying for one another or asking for prayer are between believers still on earth. These are not directed to saints who've departed this earth.