Thanks for joining in on this thread, nicolatopus.

I'd like to share some steps to get email working.

You have the option to use 2FA for your email service. Just make sure that QuickBooks have the proper authentication. 

If you're getting an error that says "QuickBooks is unable to send your email to Outlook", this is usually caused by a settings issue. 

To begin, let's make sure QuickBooks isn't set to automatically run as an administrator.

Here's how: 

1. Close QuickBooks Desktop.
2. Open the Windows Start menu.
3. Type "QuickBooks" into the search. Then right-click the QuickBooks icon and select Open file location.
4. In the folder, right-click the QuickBooks.exe file and select Properties.
5. Click the Compatibility tab.
6. Un-check the Run this program as Administrator option. If the option is grayed out, select Show Settings for All Users. This makes the option available.
7. Hit Apply and then OK.

Once done, open QuickBooks and send a test email or transaction. If you're still getting the error, you can follow Step 2 in this article: How to fix "Error: QuickBooks is unable to send your email to Outlook"

Otherwise, change your email preference. You can find the details in this link: Unable to email transactions or send forms using QuickBooks email service.

Please reach back out if you need any other assistance. I'm here to help. Take care!