SCIM (available on the Enterprise plan) lets your identity provider automatically create, update, and deactivate team member accounts as people join, change roles, or leave your company - no manual invite step needed.
From your SCIM settings, generate a provisioning token and copy the SCIM base URL into your identity provider's SCIM configuration. From then on, user changes in your identity provider sync here automatically.
If your identity provider also syncs Groups, you can map any synced group to automatically grant its members the Admin role - membership changes upstream keep the mapping in sync without any manual steps here.