Step up MFA but everytime a user needs to complete a specific action

My client wants a MFA check every time the user issues a specific action. For instance, change e-mailadres, bank account and such.
I’ve read Add Step-up Authentication and this kind of suit my needs, still when I implement this it’s not meeting my requirements. The user that allready have completed MFA, don’t have to reenter. Still my client wants to do a MFA everytime.
Is there anyway to do this?