Thanks for posting in the Community, @slamontagne496. Let's work together and troubleshoot the error message you received when creating an invoice in QuickBooks Online (QBO).
In some cases, being unable to connect to a server is due to server issues or problems with the internet connection.
If your computer is experiencing connectivity issues due to an unstable or weak internet connection, it may fail to connect to the server occasionally. To resolve this, verify the router's functionality by linking multiple devices to the same network. Once done, restart the computer and open your QBO account again to create an invoice.
If the issue persists, I suggest checking the system unit's date and time settings to ensure the program is synchronized with the server.
If none of the troubleshooting procedures above work, you may perform the following:
Furthermore, customize your invoices using the available tools in QBO to enhance your business communications with your customers. You may also decide which information to include when sending them your sales forms.
Keep in touch whenever you need additional guidance in creating invoices. I'll be happy to provide further assistance. Stay safe, and have a great rest of the day.