"This email already has an account. Sign in to pick up your school where you left off."

Where: Create your school screen (account creation).

Why: a Martialnote account already uses this email. An account is never overwritten or created twice.

What to do: tap Sign in with this email: a sign-in link arrives by email (valid 15 minutes, works once). If a school was being set up, you pick up at the step you reached. To create another school, use another email (V1: one school per person).