Mine becomes unlinked every once in a while. Try going to Plan page and press "Sync Now" button. It relinks for me.
I did have one time that the "Sync Now" button was not active and I deleted the AMT tree and re-uploaded. I did it that way since FTM on my computer is the primary Database for my genealogy and I only upload updates to AMT.
I did have one time that the "Sync Now" button was not active and I deleted the AMT tree and re-uploaded. I did it that way since FTM on my computer is the primary Database for my genealogy and I only upload updates to AMT.