How to Safely Add a New Custom Domain in FusionAuth
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We have three custom URLs in production and want to add a fourth. The interface only shows a “replace” option, which worries us in a production environment. Can you confirm if we can safely add a fourth URL without affecting the existing ones?
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Yes—you can safely add a fourth custom URL. The “replace” label appears because the system expects you to submit the entire list of domains each time. To avoid losing any URLs, make sure all four domains—including your existing three—are entered in the form before you submit. Only custom domains omitted from the list will be removed.
More details here:
Updating Custom Domains