Scheduling and managing events using Outlook.com calendar
@kelly said
There are not accept tentative decline button in my email invites ... I manage ... delegate calendars
I will assume you are using the New Outlook for Windows App. If not, see below.
There appears to have been a bug introduced by Microsoft that disables RSVP buttons on meeting invites received by a delegate. But it has been fixed by Microsoft in the most recent release.
when testing again in the new Outlook desktop app with Microsoft Outlook version 1.2026.310.300 on Targeted Release in the Current Channel, I no longer see these buttons. They are still visible in Outlook on the web. This change suggests that the behavior may be related to a specific build or release channel of the new Outlook.
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What version of Outlook do you have?
Please see this Microsoft Support article and reply with what platform (Windows, Mac, Android, iOS) and version of Outlook you are using.
Or if you access Outlook On the Web using a browser: What platform (Windows, Mac, Android, iOS) and browser (Chrome, Edge. Safari, Firefox) you are using.