Quickbooks Desktop and Outlook (New)

I'm here to ensure your client can successfully send email using the updated Outlook in QuickBooks Desktop (QBDT), @Blyons.

Before that, let's make sure that they're using the latest version of QBDT so we can see to it that these programs can work together seamlessly.

The latest Outlook update is now compatible with QBDT. However, we have received reports from users that they are unable to send emails through our program after the update. Fortunately, Windows has released a solution to this problem. I can assist you in resolving this issue.

1.  Open a Command Prompt (right-click, Run as administrator). 
2. Type and paste this registry command and press Enter: reg add HKLM\Software\Policies\Microsoft\office\16.0\common\officeupdate /v updatebranch /t REG_SZ /d Current 
3. Go to File, then Office Account. Once there, click the Update Options, then Update Now. Finally, close your Outlook until the channel change is completed. 
4.  To switch back to the Current Channel Preview later, use the same steps with the registry key in the article.

For reference, you can visit this article: Unable to send emails from QuickBooks using Outlook Desktop after update to Version 2402.

More importantly, you can also follow these steps to fix when you're unable to send your email to Outlook. If the error persists, consider reaching out to Microsoft or an IT professional for assistance with fixing Microsoft Outlook.

Additionally, you can check out this article if you've invited other users but they didn't receive any invitations and fixing error:  What to do if invited users did not receive your email invitation in QuickBooks Online.

If you need further assistance with sending an email using Outlook, please don't hesitate to click the reply button and let me know. I'm always here ready to help you.