Some Prospects with Pardot Import with user assignment column remain unassigned. Why?

Hi,

I have imported a list of prospects to Pardot and while some are properly syncing with Salesforce, some are not, and this is due to the Pardot prospect not having a user assignment. When looking at the import list, I have all rows of prospects with a user assignment (using an email), but it does not seem to be assigning. Looking at a few of the prospect records, I see a "mark as reviewed" option. Wondering what could be preventing the pardot import from happening? Thanks in advance!

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