Trip Mate review: Trip interruption claim denied

My Customer #[protected]
My Claim with Trip Mate #7226465
Viking vetted Trip Mate as a recommended insurance provider.
I purchased the insurance that included "trip interruption"

Because of a delay by Lufthansa, I missed connections on my return, forcing me to purchase an expensive same-day ticket so that I could return as planned.
Trip Mate's response: since the reason for the trip interruption with Lufthansa was because of a crew staffing issue, that contingency is NOT covered.

How is that possible?
What good is purchasing insurance vetted by Viking when something over which I had no control is arbitrarily not covered.

I realize I am delayed in lodging this complaint, but today I received another brochure from Viking re: another voyage, so I want you to know how horribly shocked and disappointed I was and am that Viking would have led me to a provider which such a non-commonsensical (and almost fraudulent) notion of what constitutes "trip interruption). Today I finally decided to send you the information.

I submitted all proper information to Trip Mate -- including my asking Lufthansa to verify the reason for the delay -- and the Viking vetted insurance company summarily dismissed it.