My office started have this same issue 9-14-22 and the "solution" (which was offered by Quickbooks and is not a solution but a work around) was to edit the preferences under send forms to Web Mail instead of Outlook.  This caused its own set of problems as Web Mail restricts the data transfer on outgoing emails.  This work around worked for several weeks then on 10-14-22 (ironically one exact month later) we are now having the same issue with Web Mail.  Invoices are created and opened to email in Quickbooks, the template is edited (as we add personal details specific to each customer and their address where work was performed), after edits are done we email the invoices and then when we go in to print that email as confirmation that it was sent, the email is the default template with NONE of our changes.  It seems that Quickbooks does not think this is an issue on their end, but it does not seem to be an issue in Outlook either.  It seems to be some sort of breakdown of communications between Quickbooks & Outlook.  Also, note...this is happening on only one computer in our office and the other one is not having these issues.  We have a shared server where our data & quickbooks is located.   

When I contacted Quickbooks help about this, I was told that the investigation (INV-58175) was closed with a resolution of "use web mail".  So now that BOTH Outlook & Wen Mail are not working, what do I do?

I have tried the above solutions and none worked. Including deleting the normal.dotm & normalmail.dotm files, uninstalling & reinstalling Quickbooks, using the Quickbooks Dr., and restarting the computer. I was unable to try Brendas fix of unchecking "use cached exchange modes to download email to an outlook data file" as this option was no where to be found .  I also did not try the "technical solution" of backing up data, email & email account settings, bookmarks, etc and editing the registry etc.  As I did not feel confident is doing all this. 

Please reopen this investigation and find a solution to this issue.