Hi there, Modamas.
It's not necessary to be in a multi-user mode when sending invoices in QuickBooks Desktop. You can still send transactions out off QuickBooks even on a single-user mode.
Also, the reason why you need to uncheck the Run as admin option is to make sure that the program is not interfering with your Outlook or Microsoft settings. Check out these articles for more details:
You can also reach out to our Technical Support Team just in case the issue persists. Here's how:
- Go to the Help menu, then select QuickBooks Desktop Help.
- Select Contact Us.
- Give a brief description of your issue, then select Let's talk and then choose a way to connect.
Aside from that, you can use this link to reach out to our Chat Support Team outside of QuickBooks using this link: Contact Us.
Don't hesitate to reach out to us again if you need anything else.
