You should not have to add the DeltaCopy link into the engine anymore, if you’re still doing that - since you’re on 4.14 as it’s already included in the engine.
Here are some steps that should cover all of the steps to make sure your SSH has been set up correctly:
Verify that Epic Games/4.13/Engine/Extras/ThirdPartyNotUE/DeltaCopy exists.
DeltaCopy path exists and contains Binaries, Source, DeltaCopy.tps and DeltaCopy_License.txt
In the Editor: select Edit > Project Settings > IOS > Build > Remote Build Options (expand)
Enter the Remote Server Name (Computer name or IP of the Mac)
Enter the RSync Name ( name of the Mac)
Link the Delta Copy install path (if pre-4.13.0, 4.13.0+ the DeltaCopy field will no longer be necessary)