Being able to convert and email to PDF and to add emails to existing PDF's was a feature in Outlook.
The feature went away with the New Outlook.
Why not just admit that Microsoft has made a mess of Outlook with its latest revision.
There are many other problems with Outlook that are too numerous to mention.
But every time I check on line I read a "solution" that solves nothing and never lays responsibility on Microsoft for a bug, which is always euphemistically referred to as an "issue".