@DianaC24 This flow action uses PegaOutlook ActiveX control which doesn't work on non-IE browsers. Even the newer versions of IE don't support ActiveX. You are better off exploring Microsoft Graph API to send meeting requests assuming you are using Exchange server.
@DianaC24 I really appreciate your prompt response. I looked at other pega articles and suggesting us to install pega - Microsoft exchange package. I'm looking at other options. I will let you know If anything works in our way