I understand how important smooth functionality is for your business operations, BethSage. 

The error message "You must enter a value for all of the fields on the Online Services Tab in QuickBooks Desktop" typically occurs when you try to save or update your online services settings in QuickBooks Desktop, but some required fields are left blank. To resolve this error, you need to make sure that you have entered values for all the mandatory fields on the Online Services Tab. 

Here are the steps to check and fill in the required fields: 

1. Open QuickBooks Desktop and go to the Edit menu.
2. Select Preferences from the drop-down menu.
3. In the Preferences window, click on Checking or Checking Accounts (depending on your version of QuickBooks).
4. Go to the Company Preferences tab.
5. Click on the Online Services tab.
6. Check each field on the Online Services Tab and ensure all required information is entered. Commonly required fields include the bank name, account number, and login credentials.
7. Fill in any missing information or update any incorrect details.
8. Once you have entered all the required information, click OK to save the changes.

By ensuring that all the mandatory fields on the Online Services Tab are filled in correctly, you should be able to save or update your online services settings without encountering the error message.

Also, let's make sure to update your QuickBooks to have the latest features and needed patches. If the same thing happens, you can open a different or a sample company file to test if you'll get similar results. 

However, I suggest contacting our phone support team since the unexpected behavior persists. To reach them: 

1. Go to the Help menu.
2. Select QuickBooks Desktop Help.
3. Click Contact Us.
4. Enter a brief description that you got both errors when trying to get the recently available bank transactions.
5. Click Continue.
6. Choose to either Message an agent or Talk to a specialist.

You can also check this article to help you set up and categorize your bank feed transactions. 

I'm only a reply away if you have any additional questions or concerns. Have a good one!