The hostname for the IdP website. In other words, the name of the server that hosts the identity provider (IdP) website, for example:
www.azuread.acme.com
This value is unique to the identity provider installation you're using.
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For the Smart Completions Authentication identity server, the IdP hostname is the same as the hostname because the Smart Completions server is provided by the Smart Completions Application Server.
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For other identity servers, contact your identity server administrator for help figuring out the IdP hostname.