Hi @NigelAyres-7142,
Welcome to Q&A forum!
The following information from this official article: Windows Server end of support and Microsoft 365 Apps.
- As of January 14, 2020, Microsoft 365 Apps isn’t supported on Windows Server 2012 R2, even though Windows Server 2012 R2 is supported until October 10, 2023.
And please note that using Microsoft 365 Apps on older, unsupported operating systems may cause performance and reliability issues over time. It is recommended that you move to Windows Server 2019 or Windows Virtual Desktop.
Thanks for your understanding.
Hope the information is helpful to you.
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