Issues Co-authoring a docm file in Group Documents?

[Ruben Kertesz]

One of the folks in our org. uploaded docm files and wanted to collaborate with others on them.

Co-authoring on these files has been very poor, with the file getting locked. Is this because docm files cannot be edited simultaneously? This is using Word 2016

[#2]

Please see this article on the requirements for co-authoring: https://support.office.com/en-US/article/Document-collaboration-and-co-authoring-EE1509B4-1F6E-401E-...