Welcome to the forum @Ian-Andrea
There was a thread about duo membership where other members had the same issue
At the time it was passed to member services but they didn’t come back with a solution
The work around suggested by forum members was to create a shared email address so your husband and you can both access the verification code
https://forum.trustedhousesitters.com/t/constant-logging-into-the-app-with-verification-code-needed