Since Windows Server 2008 R2 reached end of Extended Support 2020.
2008R2 is out of service. I suspect that there is no longer a way to get the activation for 180 days.
Since this is a technical forum and not a licensing one, if you need a definite answer you'd better contact a trained Microsoft licensing specialist regarding your licensing questions.
Please contact the Microsoft Activation Center.
Hope above information can help you.
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