Delta Dental MA moved their provider login from providers.deltadentalma.com/onboarding
to www.deltadentalma.com/sign-in with new form field selectors, and moved eligibility
search behind a "Group/Health Connector" search page keyed by subscriber ID + birthdate
instead of the old member-search form. Updates login, OTP/MFA handling, and member
search/selection across the eligibility and claim DDMA workers and their session helpers.