Apple Business Manager Error not covered on support page - Account Update Not Allowed

We have begun the processing of syncing Apple Business Manager with our Microsoft Intune instance (all Azure Active Directory accounts) via SCIM. In the logs, for 2 of our accounts, I am given the error "Account Update Not Allowed." This error is not included on this page: https://support.apple.com/en-in/guide/apple-business-manager/apddc1fec242/web , nor is Google bringing up any hits, so I don't know what it means or how to fix it.