Cannot co-author docm file in OneDrive for Business on 1906 Monthly release


Hi all,


This was announced as a new feature for Office 365 ProPlus 1906...


CoAuthoring: Tired of being locked out of your document with macros?

Now your docm files on OneDrive for Business allow simultaneous editing by multiple authors.


That said - we can't get it to work. Both are on 1906 (Monthly) and it doesn't work on older .docm or even newer ones. I have the .docm file in my OneDrive and shared, and open, but cannot co-author. Have you noticed the same? 


File in Use.png

Versions of OneDrive Sync Client are 19.103.0527.003 (colleague) and 19.123.0624.0002 (me).


Would be interested to see if anyone else has noticed the same...???


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