item.body is not an instance of Body in Outlook on the Web about office-js

[ajays-msft]

@KurtLa This is expected. You are trying to modify the body in a MessageReadCommandSurface.
You need to modify the body in MessageComposeCommandSurface,

For more details as to how you can modify the mail item, see the example below

https://learn.microsoft.com/en-us/office/dev/add-ins/tutorials/outlook-tutorial

[KurtLa]

Hey @ajays-msft,
Thank you very much for taking the time.

There might be a misunderstanding on my part, but what I aim to achieve includes things like:

• Receiving an email
• clicking on my addin,
• then:
  highlighting certain words in yellow
  adding text fragments
  commenting on things
  etc.

For example i receive an email:

Hi,
please complete task xxx by Friday.

After clicking my addin:

Hi,
please complete task xxx by Friday.
-- AddIn Note: 4 tasks due by Friday. Click ([here] for accept) or ([here] for reject).

When I change it to MessageReadCommandSurface, I can only activate my addin in "Write new mail / reply / ..." scenarios.

Therefore, I need the ability to manipulate the visible body in the read window. I want to do this inline and not open a new window. My email example is quite basic, but a real-world email can be complex and longer. It doesn't need to be saved permanently, just make the changes on demand.

[ajays-msft]

@KurtLa

Unfortunately this is not possible with the current office js capabilities.

If you think this support is essential, please feel free to create a feature request.
We track Outlook add-in feature requests on ourTech Community Page. Please submit your request there and choose the appropriate label(s). Feature requests on Tech Community are considered, when we go through our planning process