A Microsoft file hosting and synchronization service.
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Hello Steven
Thank you for sharing the screenshot.
From the screenshot, the "Get OneDrive Insider Preview updates before release" option is present but cannot be enabled on your Mac. It also appears that you're already using the latest standalone version of OneDrive.
One possible cause is that you're signed in to OneDrive with a work or school account. In some organizations, administrators can restrict access to Insider or preview channels, which can prevent the Insider option from being enabled.
Therefore, it would be helpful to confirm whether you're using a personal Microsoft account or a work/school account.
I look forward to your additional detail so we could determine the best next steps!
Best regards.