You need to add a Web Platform. See https://appwrite.io/docs/quick-starts/web#step-1

What you’re seeing is expected behavior in Appwrite — those domains (localhost, cloud.appwrite.io, appwrite.io) are not a “redirect whitelist UI”, but a platform origin validation constraint enforced by design.
Key point
For Magic URL (and other auth flows), Appwrite does not use a separate redirect URL allowlist like Supabase.
Instead, redirect eligibility is derived from registered Platforms.

Why you're not seeing your domain
If your domain is not appearing/accepted, it means it has not been added as a Platform in the project.
Go to:
Console → Project → Platforms → Add Platform
Then:
Add Web app
Set your production domain (e.g. yourdomain.com)
For local dev, use localhost
Once added, Appwrite will allow redirects originating from that platform context.

Important clarification
The list you’re seeing:
locahost
cloud.appwrite.io
appwrite.io
represents default trusted origins / examples in the UI context, not a fixed global redirect whitelist you can edit.
There is no separate “redirect URL configuration screen” like Supabase.
How Magic URL redirect actually works
Magic URL uses:
Platform origin (registered in console)
SDK-provided redirect URL in the request
Appwrite session validation
So the redirect is validated implicitly, not via a manual whitelist.

To add to what's been shared: Appwrite doesn't have a standalone "allowed redirect URLs" list like some other auth providers. The redirect validation is tied to your registered Platforms in the console.

Step-by-step fix:

1. Go to Appwrite Console → Your Project → Overview → Platforms
2. Click "Add Platform"
3. Select Web (for web apps) or the appropriate platform
4. Add your domain (e.g., yourdomain.com for production, localhost for local dev)

Once your domain is registered as a Platform, Appwrite will accept redirect URLs originating from that domain in your Magic URL flow.

Why this happens: Appwrite validates the redirect param against the registered platform origins, not a separate URL allowlist. So the error URL host must be one of: localhost, cloud.appwrite.io, appwrite.io is telling you your app's domain isn't registered as a Platform yet.

For Magic URL specifically, make sure the url you pass to account.createMagicURLToken() has the same origin as your registered Platform:

await account.createMagicURLToken(
  ID.unique(),
  'user@example.com',
  'https://yourdomain.com/auth/callback' // must match registered platform
);

Hope this clears it up!