Hello Flyrix,
To make the map compatible you should do the following.
Activate all artifacts, TOE spells and heroes for the map (this is safest done by editing the .xdb file in the .h5m archive with a text editor). EDIT Example as RMG map:
Also a map should not contain any scripts whatsoever as they may interfere with the MMH55 framework and break the mod.
I hope this was helpful.