The Identity provider URL displays the default Public external URL. Also, the tenant_base URL if configured in the Public external URLs policy. If the Identity provider URL is set to default Public external URL, then the users must prefix TENANT\repository\ to the username during login. If you select the URL in the https://tenantName.tenant_base/ format, then the users can access the Advanced Authentication portals using the short username without prefixing the TENANT\repository\. The tenant_base represents the domain name. The domain name is shared among the tenants to generate a unique URL for each tenant.
For example, consider top tenant URL is caf.aacloud.com, here the domain base is aacloud.com. If the name of a new tenant is cyberres then the tenant URL becomes cyberres.aacloud.com.