I too have been getting these recently and have been reporting these emails in hopes that we can get a feature to be able to use wildcard characters such as preview@*.* in the junk mail block list setting to block all variations of the junk emails that start with preview@.
But this is Microsoft. Saving us time and effort is not in their DNA anymore. Subscription money doesn't get you much these days. If it weren't for the fact my family needs Office, I would delete my Microsoft account and move on. There was a time 40 years ago where this kind of issue would be resolved in less than a week. How things have changed since then.