Microsoft Word opens custom WebDav server in Read Only mode

I'm trying to implement a custom WebDav server in Django and when I try to open a document in Microsoft Word using Microsoft's Office URI, it always opens in read-only mode. In my OPTIONS endpoint I'm returning the needed headers of

DAV: 1,2
MS-Author-Via: DAV

And when I look at which HTTP requests are being sent, I only see OPTIONS, GET, and HEAD. I never see an attempt at LOCK

I'm testing this on a Mac.

What am I missing to get Microsoft Word to open my document in read/write?

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