403 on /messages/in_group/ with threaded=true

Occasional Visitor

A week ago I started getting a 403 Forbidden error, trying to get threaded messages in a group.  I can get unthreaded messages, and threaded messages from another group.  I'm Admin of the group--and this worked a week ago.

Doesn't work:

Does work:

Any thoughts on the cause or how I can escalate to Microsoft for troubleshooting? TIA.

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