I have recently found other tree that has information about my relatives and got access to it. Unfortunatelly I can't get infromation from that tree into mine for some reason.
First of all there were no automatic matches (and I waited for few days)
Secondly I could not find the person by full name, getting no matches (even if I copy - paste name exactly).
So I did a search by last name only and found correct entry marked as private. It should be accessible for me, but still in the search I see it as private (I still can click through it to get to full information in other tree).
Now I attached it to the person entry in my tree, but still can't extract any information - it just says that information would be available shortly for few hours already.
Also I had a person with memberships on both sites. She was mapped to a person on each site as well. It did not help much to bring a “smart match”.
Match showed up immediately after I added birth year to her father. So matches are not disabled. Its just system is not smart enough to treat manually mapped people or people linked through same user as a match.