Resolving "Unknown Error Has Occurred" during Apple ID Login on macOS Catalina

If you've encountered an "Unknown Error" while trying to log in to your Apple ID on macOS Catalina, this guide will walk you through a solution based on previous bad experiences and recommendations from Apple Advisors. The issue often arises due to corrupted files acquired during internet downloads. Follow these steps to create a new Administrator account, which involves backing up your data and replacing your existing user account.

Note: Before proceeding, ensure you have backed up all important data using iCloud, an external hard drive, or Time Machine.

Step 1: Backup Your Data

• Transfer your most important documents, files, and data to iCloud, an external hard drive, or Time Machine to ensure you don't lose any information during the process.

Step 2: Create a New Administrator Account

1. Navigate to "System Preferences" in the Apple menu.
2. Select "Users & Groups."
3. Click the lock icon in the bottom left corner to make changes. You may be prompted to enter your existing administrator password.
4. Click the "+" button below the user list to add a new user.
5. Choose "Administrator" as the account type.
6. Fill in the Full Name and Password for your new administrator account. Make sure to remember these credentials.
7. Click "Create User."

8. Try Logging in to Apple ID from the New Account:

Once the new Administrator account is created, attempt to log in to your Apple ID directly from "System Preferences" to check if the Apple ID functionality is working as expected.

Step 3: Delete Existing User Account

1. Still in "Users & Groups," select your existing user account from the list.
2. Click the "-" (minus) button at the bottom to delete the account.
3. You will be asked whether to save the home folder as a disk image. Choose the appropriate option based on your preference.
4. Confirm the deletion.

Step 4: Log in with the New Administrator Account

1. Log out of your current session.
2. Log in using the newly created Administrator account.

Step 5: Retry Apple ID Login

1. Open "System Preferences" and navigate to "Apple ID."
2. Attempt to log in with your Apple ID using the new Administrator account.

Conclusion:

Creating a new Administrator account and deleting the existing user account can resolve the "Unknown Error" during Apple ID login on macOS Catalina. This process helps eliminate corrupted files that may be causing the issue. Remember to keep your new account credentials secure, and you should now be able to successfully log in to your Apple ID.