The update keeps reverting because 28.0 Preview isn’t fully available yet for your region/tenant.
Sometimes the admin center shows it, but scheduling won’t “stick” until Microsoft fully rolls it out.
Fast workaround:
Create a new sandbox and pick 28.0 (Early Access Preview) during creation, this usually works even when upgrading an existing sandbox doesn’t.
Regards,
Oussama Sabbouh
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