Headway therapist suddenly out of network in insurance portal?

This has been sort of a shock at the end of the year. I’ve been seeing the same amazing therapist via telehealth for about two years and have always paid a $35 copay through Headway.

Recently I noticed that my insurance portal shows my last 3 claims as approved but insurance paid $0, lists the full session cost, $275, as patient responsibility, and labels my therapist as out of network. However, Headway’s portal still lists the therapist as in network, and I’ve only been charged the $35 copay with no balance changes or notices in Headway.

What should Ido next? will I suddenly be charged for the past 3 sessions that were labeled as out of network? Should Icancel my next therapy appointments just in case?