Hello Community Users:waving_hand:,  Below is the current update sent out today regarding the fix for the delivery issues on invoices in Quickbooks Online.

We're currently implementing measures to fix this issue. Please know that this is a high priority for us and will continue to be a focus and priority until fully resolved.
Our team is aware of the matter and is in the process of implementing a fix that will solve this issue.

Workaround:

In the meantime, while the issue is being worked on by our engineering team please continue to use the below options, as a workaround: 

• You can save your form as a PDF and send it via email through your business or other email address
• (For invoices or estimates only) You can send your customer a link to their invoice or estimate through SMS or messenger service. Simply click on “save and share link” then select “copy link” and paste it into your SMS or messenger service.
• If you have a Gmail or G-suite email account, you can use the Send with Gmail feature to send QBO forms from your own address following the steps in Use your Gmail address to send invoices (https://quickbooks.intuit.com/learn-support/en-uk/help-article/invoicing/use-gmail-address-send-invo...).
• You can save your document as a PDF, print it, and send your customer their forms via mail

or

• Customers -> select Invoices -> batch actions -> Print -> Save as PDF -> email from onw email service
• Statement of open invoice -> Open Invoices report -> Print -> Save as PDF -> email from own email service

If you are experiencing difficulties implementing any of the proposed workarounds, please do not hesitate to reach out on this thread.