(1) Explain your problem, don't simply post "This isn't working". What were you doing when you faced the problem? What have you tried to resolve - did you look for a solution using "Search" ? Has it happened just once or several times?
(2) It's also good to get feedback when a solution is found, return to the original post to explain how it was resolved so that more people can also use the results.
Maybe the filter in the snippet below can help you in a way.
Unfortunately, it won't filter for only activities with duplicate same ID predecessors with SS AND FF logic but will filter for all activities with with SS OR FF predecessors logic. And you can then narrow down the duplicate ones.