iCloud-specific calendars are not syncing to my computer...

The issue:

My iCloud-specific calendars are not syncing to my computer—instead Calendar.app keeps returning a rather cryptic error message. I have tried multiple things and I can't seem to solve this syncing issue. I don't really know when this error started but it's really annoying. 🙂 I'd really love any help figuring this out!

Whenever I launch Calendar.app, I keep getting an error that looks like this:

The server responded with an error.

The request (CalDAVMigrateToServerQueueableOperation) for account “iCloud” failed.

Screenshot of the error message:

What have I done so far to zero effect:

• I have signed out then re-signed into iCloud on my MacBook.
• I have signed out then re-signed into all my Internet Accounts in the System Preferences.
• I have repeatedly toggled the preferences to sync calendar events in iCloud preferences pane.
• I have restarted my computer pretty every time I tried to fix it.
• Checked to see if the Calendar app on iCloud.app as well as my other Apple devices is syncing the iCloud-specific calendars correctly (spoiler, they are working perfectly fine. Just not working on my computer.)

Relevant Specs:

MacOS Mojave 10.14 (18A389) running on a MacBook Pro (15-inch, 2018).

Calendars are synced:

• iCloud Family & Work calendars (syncing does not work)
• A personal Google gmail account (syncing works)
• A business Google GSuite account (syncing works)