I have opened a PS session with the exchange online server in question, can Get-TransportConfig with good result but when I attempt to use common commands
"Set-TransportConfig -ExternalDsnMaxMessageAttachSize 25MB",
"Set-TransportConfig -InternalDsnMaxMessageAttachSize 25MB",
I get the results:
"A parameter cannot be found that matches parameter name 'InternalDsnMaxMessageAttachSize'. ..."
Is there a way to increase the Max Attachment Size in Exchange online?