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WordPress security tokens (nonces) expire after a period of inactivity — simply reload the dashboard page and try again.
Use the Refresh action in the Grid Manager to re-sync from Instagram. If posts still don’t appear, reconnect your Instagram account from Settings — access tokens can occasionally need to be re-authorized.
Your plan status refreshes automatically, but if it hasn’t updated yet, use the Refresh action in your dashboard (or reload the page) to re-sync your current plan from your account.