You can find a full tutorial on how to create a Microsoft Office Taskpane Addin here.

https://stefan-weber.medium.com/build-a-deepl-translate-add-in-for-microsoft-outlook-with-outsystems-a59a9dd34e3e

Client Action

OfficeHost_AccessTokenGet

Retrieves the users access token from the Office Host. Returns IsSuccess true if a token could be retrieved and the token itself.

Server Action

OfficeHost_AccessTokenLogin

Takes the token as input, along with the targeted audience (taken from Azure App registrations) and performs an OutSystems login.

Returns IsSuccess true and UserId if successful.