External attendees see “Send the Response Now” although no response was requested in Exchange Server (KB5012761)

Applies To
Exchange Server 2019 Exchange Server 2016

Symptoms

If an exception is created for a recurring meeting series, external attendees are presented the “Send the Response Now” option even though the meeting invitation was sent without a request for a response in Microsoft Exchange Server.

Resolution

To fix this issue, install the following updates, as appropriate:

Cumulative Update 12 for Exchange Server 2019 or a later cumulative update for Exchange Server 2019

Cumulative Update 23 for Exchange Server 2016 or a later cumulative update for Exchange Server 2016