Dear Sir/Madam,
You cannot by yourself refund the license or change it to a cloud license. However you can contact Atlassian Support about that!
https://support.atlassian.com/contact/
If you have bought the server license within the last 30 days, then Atlassian is able to refund the license. After that, you can buy the correct license for cloud.
Friendly Regards,
Jeremy Mooiman
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