Synchfilter equal current user as external loggedin user

I have made a new relationship between owner on contact entity to contact again. This make it possible to set a contact as a owner of a contact, and not only a system user/employee as contact.

then I have set a synch filter on contacts as user equal to current user.

My mobile project is enabled for external users and it autenthicate against contact entity. I would then expect to see only "my self" in the contact list, but i see none.

My goal is to make the external users able to update their contact details.

I have the same issue on a custom entity i have named projects. I want the contact to see only the projects that the logged in external user/contact owns.

Anyone tried the same and solved it?

Regards
Stig/Norway