The error message, “URL doesn’t pass security tests,” can show up when the link that you are trying to use as a redirection URL does not match the redirection allowlist set for your app. For example, Branch can create custom allowlists where links created for your app can only redirect to *.example.com.
If you try to create a link that redirects to any other domain other than *.example.com, you will see this error message and the link will not be created.
You can update your redirection allowlist in Branch. Read our Advanced Link Configuration article to learn how.