To install the on-premise, Data Center + EWS based version of the Meetical Meetings Outlook Add-in, try the following approach. If you are on Confluence Cloud and Microsoft 365, please use the Outlook Add-in available in the Microsoft AppSource Store.
You get the XML file from Confluence Admin → “Meetical Configuration”.
To install an Outlook Add-in from an XML manifest file using PowerShell, you can use the New-OfficeWebAddIn cmdlet provided by the OfficeWebAddInManagement module. However, this module isn't installed by default, so you may need to install it first.
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