Two possible reasons:
Verification. If your KYC is incomplete or the name on your payment method doesn't match your identity documents, the payout is frozen until it is resolved. Your simulated performance result is not voided. If it stays unresolved for 90 days, the account is closed without payout.
Investigation. If we're reviewing a suspected rule breach, the payout may be held for up to 30 days. You will be notified in writing.