We have 500+ adresses shared,

when I create a mail from the serving client (the one that shares the adresses), then i can start typing in the to: field and it wil try to autocompleet.
but when I am on a client account (someone that uses the shared contacts) the autocompleet is not working on the shared contacts,

Is this posible at all? if not that this would be a feature request.
but maybe somhow it just needs to be indexed for the clients?