The Azure Active Directory Sync Version Release History article does not contain the msExchArchiveStatus as a synched attribute. A previous article for DirSync does mention this attribute as:
Synced Object Attribute | User | Group | Contact (Src) | Description |
msExchArchiveStatus | Read/Write | - | - | Created in the |
Is this attribute excluded in AAD Sync? I noticed a warning about this attribute in AAD Sync version 1.0.0470.1023 which was not importing this attribute from the local AD causing "exported-change-not-reimported" warnings.