CHW-4211 AccountAlreadyExists
an account with this email already exists; sign in and then accept the invitation from the same session
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Default message: an account with this email already exists; sign in and then accept the invitation from the same session
HTTP status:409(client)
Problem. An invite-accept signup collided with an existing account. Cause. The signed-out signup flow writes a new user row, which must be unique by email and username. Fix. Sign in to the existing account first, then re-open the invitation link to accept from an authenticated session. HTTP 409.