I had a Pending Merge hanging for a very long time. My version Private, other one Public. Finally, yesterday, pressed "Accept" -- all it got me was an Ad for Pro.
Sent request to the Manager of the other Profile to take over Management - she did, now I manage both of them - tried again - again, just Ad for Pro.
Changed the other Profile to Private - now two private Profiles that I manage, with Pending Merge - clicked Accept - again, just got Ad for Pro.
Be aware the Non-Pros can no longer help you out here by accepting your requests to Merge!