Bring text from a column in one table to another table, each in a new row

goodmorning @JEC_Aviation

would you try this in your button?

Sequence(1,thisrow.Registrados.Count()).ForEach(
  [Listado alumnos participantes].AddRow(
    [Nombre completo],thisrow.Registrados.Nth(CurrentValue)
  )
)

Cheers, Christiaan