Hello @cloudguy2020 ,
Thanks for reaching out and apologize for delayed response.
Could you please help me understanding what is "Angular login page"? Do you have Angular based application which you need to enable SSO with Azure AD? if so I would recommend you to refer this article
Azure AD always relay on https://login.microsoftonline.com/ endpoint for authentication which can't be changed, however, you could Add branding to your organization's Azure Active Directory sign-in page. If application is hosted in Azure AD B2C Tenant then you can use Custom-Domain like: login.contoso.com, instead of login.microsoftonline.com.
Reference Article: https://feedback.azure.com/forums/169401-azure-active-directory/suggestions/15334317-customer-owned-domains
Hope this helps.
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