Illustrator version 25.2.3 and ArcGIS Maps for Adobe Creative Cloud version 3.0.0 continue to remain the latest supported versions for macOS users. Windows operating system users can utilize the version 3.0.1 update for plugin.
A dependency issue with a recent Illustrator version for macOS causes the map sync process to fail. Teams at Adobe and Esri are working together for a resolution toward this. For further assistance please contact Adobe and Esri technical support with information about the operating system version, Adobe apps versions and plugins version.
What can you do?
If possible, macOS users are recommended not upgrade to Illustrator version 25.3 or later
If upgraded and need to work with ArcGIS Maps for Adobe, then you will need to
Revert to a previous version (25.2.3) using steps outlined here and