The expression refers to multiple columns. Multiple columns cannot be converted to a scalar value.

First to check is this a measure or New table.

If measure you can't return FILTER as that is a table, use New table.

If _Anio holds 3 students you can't use SelectedValue instead use Values() as that can return a column of values.

With values you need CalculateTable instead of Calculate and IN instead of =.

table =

var _anio = CalculateTable( Values('table'[anio_ingresso), Keepfilter(table))

Return

Filter(
all(Table)

,table[column] IN _Anio
)