You probably have .DS_Store files written somewhere in the UE project.
make sure that you have checked "Use PAK files" in Packaging section.
go into your project folder and run: `find . -name '.DS_Store' -type f -delete' to delete all .DS_Store files
That should be enough to remove all finder information from the APP file before signing.
if you still get that error check APP file with `xattr -lc '
G2Ames
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