Hi,
This could be helpful to get started
https://practical365.com/collaboration/teams/using-powershell-to-apply-messaging-policies-to-teams-users/
To convert an object to json you can use the ConvertTo-Json cmdlet.
https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.utility/convertto-json
Best Regards,
Ian Xue
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