If get" system error unable to connect "When trying to create invoice ?

Hello there, @mahoneyprojectso! We are delighted to see you in our Community space. We hear your sentiments and understand that experiencing an error can disrupt your business activities within the program. 

Please know that this isn't what we want you to encounter. It's our pleasure to provide you with all the necessary information with the error message when creating an invoice in QuickBooks Online (QBO).

We've received reports about the error message "Unable to connect to our service" when creating an invoice. We recommend reaching out to our support team so that they can add you to the list of affected users. Please be assured that our software engineers are working diligently to provide a resolution, and we'll keep you updated via email.

To contact support:

1. Sign in to your QuickBooks Online company. 
2. Select Help (?).
3. Click either tab to get started: Assistant or Talk to Human.
4. Search Contact Us, then Start a chat with a support expert.

Please ensure to review their support hours to know when agents are available. This way, you can contact them at a time that is convenient for you.

We have also included some articles that guide managing invoice-related tasks:

• Create invoices in QuickBooks Online
• Customize invoices, estimates, and sales receipts in QuickBooks Online
• Set up and send progress invoices in QuickBooks Online

Please don't hesitate to reply anytime if you have other questions or concerns about creating invoices in QuickBooks. We're always available and willing to lend a hand with your queries. Have a great day ahead, @mahoneyprojectso.