Hi there! I see you're encountering an "Access Denied" error when trying to make a reservation on the Choice Hotels app. I can help you with that. To better assist you:

- Are you using the Choice Hotels app on your Windows device or accessing the website through your browser?
- Have you tried any steps so far, like restarting the app or clearing cache?
- Do you get this error immediately after logging in or at another part of the reservation process?

This info will help me guide you through the right fixes. Meanwhile, here are some general steps we can try:

1. Make sure you are using the latest version of the Choice Hotels app or, if on a browser, a supported modern browser. Sometimes outdated apps or browsers cause access issues.
2. Clear the cache and cookies of your browser if using one. This can resolve stored data conflicts causing "Access Denied."
- For your Windows device with WebKit engine browser (like Safari or similar), look for a clear browsing data option under settings.
3. If using the app, try uninstalling and reinstalling it to refresh any corrupted files.
4. Check that your network connection is stable and not using VPN or proxy servers that might block access.
5. Confirm that your login credentials are correct. Access Denied can sometimes appear if the system blocks your account temporarily due to login attempts or security rules.

If these don’t help, there may be some backend or account-specific issue we need to look into.

Could you try these and let me know where you get stuck or if you see any change? That way I can guide you further!