A fragment from the Schøyen Collection (4th-5th century) speaks of Michael being appealed to by the damned to intercede for them.
BL syr. Add. 17,137, f. 9a, second column, in Stephen J. Shoemaker, “New Syriac Dormition Fragments from the Palimpsests in the Schøyen Collection and the British Library,” in The Dormition and Assumption Apocrypha (Studies on Early Christian Apocrypha 15; Leuven: Peeters, 2018), 306-7
. . . from them
and Jesus and Michael.
And he left Mary
and the apostles on the earth
so that they would understand about their suffering.
And . . .those in torment
. . .
. . . and saying,
“Mary light and mother
of the light, Mary life
and mother of life, Mary
lamp-stand of gold that bears
the one bearing . . . Mary
master and mother of the master
our Lord, Mary, our queen
and the mother of our king and God,
intercede on our behalf with your son
that he give us a little rest.”
And on account of these things
they spoke to Peter
and Andrew and John
and all of the apostles. “What
have you said concerning these things?”
And immediately our Savior appeared
to [them], and he came
to . . the place of torment . . .
Shoemaker (Ibid., 302) noted that:
Among the most striking features of this concluding episode are the appeals from the damned for intercession, first to Michael, then the Virgin Mary, and finally the apostles.