When you log into Databricks using a vanity URL (such as
mycompany.cloud.databricks.com), you are redirected to a single sign-on (SSO) server for authentication. When that server redirects you back to the Databricks website, the URL changes from the vanity URL to the original deployment URL (such as
dbc-XXXX.cloud.databricks.com). This can happen even if a CNAME record exists that points to the vanity URL.
This issue happens if the SSO administrator used the original deployment URL when they configured the Databricks application in the Identity Provider (IdP).