isSetSupported('Mailbox', '1.8') returns false in add-in running in OWA with Office365

问题

In a supported environment listed here. Office.context.requirements.isSetSupported('Mailbox', '1.8') is returning false in OWA (Chrome) with Office365. When can we expect isSetSupported to return true for v1.8 in this environment?

I'm trying to determine if Office.context.mailbox.item.getAttachmentContentAsync() is supported on the client/server configuration running the add-in. Should we be checking the Exchange server version + client build version against known functioning permutations or will Office.context.requirements.isSetSupported('Mailbox', '1.8') encapsulate these checks for us?

Current behavior:
isSetSupported('Mailbox', '1.8') returns false in OWA with Office365.

Expected behavior:
isSetSupported('Mailbox', '1.8') returns true in OWA with Office365.

Other:
Office.context.mailbox.diagnostics.hostVersion is returning a strange string of the form "2019102702.16". This doesn't seem to match any of the Exchange Server Versions. Is this string the expected format of Exchange Online server versions?

Notes:
isSetSupported('Mailbox', '1.8') returns true in the latest builds of Outlook Desktop and Outlook for Mac as expected with Office365.

Environment:
Platform: Office Online
Host: Outlook
Office version number: Office.context.diagnostics.version=16.0.10908.10000 Office.context.mailbox.diagnostics.hostVersion=2019102702.12

Operating System: Mac
Browser (if using Office Online): Chrome .

回答1:

Thanks for reporting this issue regarding this issue. It has been put on our backlog. We unfortunately have no timelines to share at this point.

来源：https://stackoverflow.com/questions/58756762/issetsupportedmailbox-1-8-returns-false-in-add-in-running-in-owa-with-off