Exchange Online
A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.
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HI All,
Is there a possibility where we can enable Archive mailbox in Exchange Onpremises/2019 for an Exchange Online User mailbox?
No, that is not possible.
You can only enable an archive in Exchange Online for an on-prem primary mailbox or an Exchange Online Primary Mailbox, not the other way around.
https://learn.microsoft.com/en-us/exchange/hybrid-deployment/create-cloud-based-archive
Ok, thanks @Andy David - MVP , I knew technically it wasn't possible, just tryig to tweak something possible.