How do I configure Calendar integration for some users and not others?
You can manage which users have access to Calendar integration by activating the Calendar integration enabled setting by policy. See Activate Calendar integration in your policies (time off only).
Can I use another SSO provider with Microsoft 365 integration?
Only Microsoft Azure AD is currently supported. If you want to implement the integration with another provider such as Okta, ensure that the Federation ID field is populated for users with the same email address used for your Microsoft 365 implementation. However, note that Sage People does not support this configuration at this time.