'Details' Internet Accounts preferences?

Julius N Said:

"'Details' Internet Accounts preferences?: Yes, I have iCloud enabled. I have 7 other internet accounts as well, but the details button mysteriously stopped working on them and seems to be back to normal for now."

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Two Thoughts:

A. System Preferences Not Responding:

If System Preferences was not responding, then you should have Force Quit it.:

1. Go to: Apple menu
2. Select: Force Quit
3. Select: System Preferences
4. Select: Force Quit button
5. Select: Force Quit button

B. Damaged System Files:

Boot into Safe Mode today. In Safe Mode, damages system files (i.e. caches), are often fixed.

iCloud Enabled should like something like the pic below

Julius N Said:

"'Details' Internet Accounts preferences?: In Mac OS Catalina when I select an account in Internet Accounts preferences there's a 'Details...' button. Nothing happens when I click on it. What is it supposed to do?"

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Try a New Admin:

Try creating a new Administrator user (for temporary use), and then see if you can modify it through that user.

Sometimes, Apple Services are having issues and worth checking the Status Report

If you are using iCloud Enabled it will open and show what is being used in iCloud.