Outlook for Microsoft 365
Open the message, and from the menu, click Tags Message Options button.
The information needed will be displayed in the section labeled Internet headers. Copy the information by highlighting it, right-clicking on it and selecting Copy from the menu. Paste it into the incident submitted describing the problem.
Outlook Web Access (aka Webmail)
Right click a open message and click View and click View message details. The information needed will be displayed in the section labeled Message details. Copy the information by highlighting it, right-clicking on it and selecting Copy from the menu. Paste it into the incident submitted describing the problem.