Ok guys.
*It can't be sus2, because the Eb is a 9th from the root. Not a 2nd.
*Nor it is a maj7, since there is no M3.
*There is no chord named maj7add9. If you have the M7 and the 9th, it becomes a Maj9.
*Of all the notes in the scale, the 7th is not "available" as an added note in theory.
I think it is an Ab chord with a Db on the bass. Making it a Slash Chord named:

Ab/Db