If the casino app refuses to accept your credentials, try this concise troubleshooting checklist before contacting support. Start by using the official link: Ninewin.

• Confirm username/email and reset the password via the app or email reset.
• Update or reinstall the app; cached data can block authentication—clear cache first.
• Check network (use mobile data if Wi‑Fi fails) and disable VPNs that interfere with region locks.
• Verify account status: some accounts require ID verification before login.
• Enable biometric or 2FA options once access is restored to prevent future lockouts.

Follow these steps in order; if problems persist, take screenshots and contact support with device details for a faster resolution.