Can Workplace support Just-in-Time provisioning via SSO?
No, we don't take SAML attributes and provision users. However, you can use self invite, or one of these provisioning methods.
To mimic partial behavior of Just-In-Time provisioning, you must ensure that single sign-on is enabled and Self Invite is on. Once you've made sure your community's settings are updated with those changes, you can create a SCIM-based user management/connector app.
Note: Workplace is now supporting SCIM v2.0, and will be deprecating support for SCIM v1.1. SCIM v2.0 improves groups management by letting you more easily sync groups and the management of group members, and lets you provision more than 500,000 users.