Other questions

Your experience in sending forms using QuickBooks E-Mail has been challenging, especially since you can't add attachments or any details to the form you want to send, which is understandable, @e1d inc.

With that in mind, I recommend contacting QuickBooks Desktop (QBDT) Live Support because this issue needs further internal review of your account, since there are questions that need to be asked, like when this issue occurs, what you did in your account before you experienced this error, and many more. 

This way, they will be able to determine the root cause of the issue and provide the steps to resolve it. Here's how:

1. Go to Help, then select QuickBooks Desktop Help.
2. Select the Contact Us button.
3. Enter a brief description of your concern in the "What can we help you with? " section and click Continue.
4. Choose a way to connect (Chat or Callback).

Please do not hesitate to leave a comment below should you possess any further inquiries pertaining to QuickBooks E-mail and send forms. We're always here to help. Stay safe.