some iCloud data isn't synching

“some iCloud data isn't synching: […]It is telling me that I have the wrong password for my MacBook Pro (I am using the correct one)..[…]”

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Troubleshooting Login:

A. Log in, while Booted in Safe Mode:

In Safe Mode, Login Items do not run at login, certain preferences are set aside, and damaged system files are then reset. So, once booted in to Safe Mode, and see if you can the login. Once tried, wait 30 seconds, and then restart won’t Mac, booting up normally. For instructions, go here: How to Use safe Mode on your Mac - Apple Support

B. Report this to Apple:

Do your Part: Report this to Apple. Apple may not get back to you directly, but the more feedback Apple receives on this, the more they will know what is going on, and what needs to be fixed in upcoming updates.

1. Go Here: Feedback - macOS - Apple
2. Select: "Bug Report" for the "Feedback Type"
3. Comment: that this all started after installing an update, and how you have troubleshot it thus far. Include the URL to this thread.
4. Proceed from there as necessary

userapple1989 Said:

“some iCloud data isn't synching: […]It is now telling me I need to delete all iCloud data to be able to use end to end encrypted data. This is highly frustrating since this just came with an update.[…]”

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Safely Clear the iCloud Storage:

You can only store so much in iCloud. So, clear space…

One unique method...

Download All of iCloud:

One thought would be to download all of iCloud, and then search through it in Finder on a Mac. You would download it to an external drive, and then open the drive in Finder. Search through it using the search bar on the top-right corner of the Finder window. Once found, you can trash what's in iCloud using Finder. Use my user tip: Getting a Quick and Direct "iCloud Drive-to-External Hard Drive" Download - User Tip

Thank you for the screenshot.

Backup iCloud:

If you need to empty iCloud Storage, then export all of it to the external hard drive, and then empty it. As for being encrypted, it likely is requiring to use a new password, and applying it to the entire install.