I have firebase authentication with email/password sign-in. Normally it is working just fine when we make the call
await user.sendEmailVerification();
and it sends the email using the template in the console.

Now I am trying to change the url to appsflyer's onelink, so I can direct users back to the app after they click on the verification link. ( I guess firebase dynamic links are deprecated so trying to use appsflyer) To do that I define the actionCodeSettings and pass it as argument.

`
final actionCodeSettings = ActionCodeSettings(
url: oneLink, // onelink url created by appsflyer.
handleCodeInApp: false, // allow handling in-app if link is opened on device
iOSBundleId: ,
);

 await user.sendEmailVerification(actionCodeSettings);

`
This time I am just getting "FirebaseAuthException ([firebase_auth/internal-error] An internal error has occurred, print and inspect the error details for more information.)" error which doesn't say much. I double checked the bundle id, and URL, what am I missing?