In Office.context.mailbox.item.getInitializationContextAsync, asyncResult is supposed to be a string, but instead it is coming as JSON object in Outlook Desktop.

Question

We’ve encountered a discrepancy with mailboxItem.getInitializationContextAsync. In Outlook on the web(OWA), asyncResult.value returns a string, whereas in the desktop version, it returns a JSON object.

https://learn.microsoft.com/en-us/office/dev/add-ins/reference/objectmodel/preview-requirement-set/office.context.mailbox.item#methods

Because of this inconsistency, JSON.parse of async result fails on the desktop version, while it works fine in the browser.

https://learn.microsoft.com/en-us/javascript/api/outlook/office.messageread?view=outlook-js-preview&preserve-view=true#outlook-office-messageread-getinitializationcontextasync-member(1)