Where Forecast is available, it buys toward your saved coverage target only when coverage falls below your trigger. It also needs paid-number demand, an eligible saved payment method, authorization, and enough monthly budget for a minimum refill. Selecting its tab does not save or enable it.
Check the saved policy and the latest action notice in Billing. No paid demand or enough existing coverage means no purchase is needed. If a payment is already unresolved, review that purchase rather than enabling another top-up. Report a conflicting estimate and status to support with their time.