If you are getting the error about a new event setup that means that your custom domain isn't fully setup.

If you have not started the domain setup process you can begin that here:

If you have already created your domain we would recommend following the steps in this article. Paying special attention to adding an ad account and Step 3!

If you need additional help we have domain set up calls available where we can help you set up the domain in your Facebook business manager.

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