Using classic Outlook for Windows in business environments
A calendar reply message cannot be recalled the same way as an email message.
For meeting responses in Outlook, the supported actions are to open the meeting request and respond with Accept, Tentative, or Decline, or change the response later if the client supports editing the RSVP.
For sent email recall in classic Outlook, recall applies to email messages in Sent Items, not calendar reply messages. In classic Outlook, the Recall This Message command is available only for supported email scenarios, and it is not available in Outlook on the web. Message recall also requires that both sender and recipient use Microsoft 365 work or school accounts in the same organization for supported recall scenarios.
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