After migrating to the Zendesk for Salesforce integration, I see an error in the App sidebar that states Failed to synchronize info. Please try again later.
Sometimes during a migration, the field-references within the App configuration aren't updated properly. To resolve this, ask an admin to click Configure settings.
Within those settings, the objects may need to be removed and re-added. Zendesk recommends taking a screen-shot of the settings you have to make sure you re-map the same fields after you recreate these objects.
Here's a GIF demonstrating how to remove and recreate objects:
If you're still seeing the "Failed to synchronize info" error after removing and re-adding those objects, please open a ticket with our support team so we can take a closer look.