Outlook Addin currently does not support Clipboard API, because containing iframe does not have appropriate permissions. Currently the only other option to copy text is to use deprecated document.exe...
Any updates on this?
I need the IFrame to allow "clipboard-read" and "clipboard-write" (see
https://developer.mozilla.org/en-US/docs/Web/API/Clipboard_API) in order to e.g. read the clipboard when the user has copied an e-mail item or any other use case in our integration, or write to the clipboard when the user wants to perform such a use-case in our add-in.
We have the same issue in Word, Excel, PowerPoint as well as Teams.
Currently the "allow" attribute of the IFrame only contains "local-network-access" which is not sufficient for our needs.
Maybe this could be configurable through the add-in manifest?