Long-time Ambassador Elite account with lifetime status shut down overnight - no response from Marriott

I’ve spent thousands of nights with Marriott over the past nearly decade, have been an Ambassador Elite for a long time, with lifetime status, and have spend hundreds of thousands of dollars.

A few weeks ago, my account was shut down by their Risk team. No prior warning, and I haven’t received a meaningful explanation despite multiple escalations.

I’ve already told them I’m willing to resolve anything on their side.

Has anyone seen something like this before or had success getting it resolved?