Hello,
Outside of this: https://docs.servicenow.com/bundle/paris-platform-administration/page/integrate/authentication/conce...
You wouldn't have any custom URLs per domain within the domain separated instance.
You can create portals for each domain and then the URLs could be: https://yourinstance.service-now.com/customer1, https://yourinstance.service-now.com/customer2, https://yourinstance.service-now.com/customer3.
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Please consider marking my reply as Helpful and/or Accept Solution, if applicable. Thanks!
