For what it's worth, our Auditors (not Cyber Security Insurance co) were requiring password changes until I took the time to point out to them that it was a dated practice.
I shared some of the resources on new best practices, and the following year they had removed the requirement.
So it may be worth trying if you hadn't.
But yeah, I certainly wouldn't count on getting them to change.
Changing a strong, un-compromised password is bad practice -and may actually increase odds of bad password habits. BUT - the reality is that most places/people still don't realize that their password HAS been compromised until it's too late. So I can still see the logic in just taking the oldschool "hammer" approach.