Hi there, Mark.

Let me help you address the issue where you're repeatedly prompted to log in to your Intuit account, even though you haven’t logged out, while trying to complete important tasks like sending invoices and estimates. 

First, let's start by ensuring that your QuickBooks is updated by following these steps:

1. Navigate to the Help menu, then select Update QuickBooks Desktop.
2. Select Update Now, then Get Updates.
3. Close and reopen QuickBooks to refresh it.

Next, update your sign-in settings to select a specific timeframe of up to 90 days during which you can remain signed in, avoiding the hassle of constantly re-entering your credentials.

Here's how:

1. Go to Edit and then select Preferences.
2. Select General and then Company Preferences.
3. In Mange login settings, select Keep user logged in for:
4. Select 1, 2, 7, 30, 60, or 90 days and then select OK.

Please note that once you turn on this option. If you go to File, then Close Company, it'll only close the Company File and won't sign off the user.

If the issue persists after following these steps, I recommend contacting our live support team for further assistance. They can troubleshoot this case further and ensure you won't encounter the same prompt.

We'll provide ongoing assistance if you still have additional concerns.