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hypothesizing, but if Comer couldn't find it, neither will you. Here's an excerpt from the linked Time Magazine summary...
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Have other government officials used aliases?

Yes. It’s not unusual for high-profile government officials to use alternate names in email addresses for security reasons.

Obama White House officials publicly addressed the use of pseudonyms in official government email addresses a decade ago. In 2013, when the Associated Press reported that Obama Administration officials were using email addresses under different names, Jay Carney, who was White House Press Secretary at the time, described it as "a practice consistent with prior administrations of both parties" that makes "eminent sense." If high-profile officials "are inundated in one account with either public emails, or spam or the like, then they can continue to use their other account for normal work," Carney said at the time, according to CBS News.

In 2016, then-White House press secretary Josh Earnest confirmed that President Barack Obama was using an email address that was intentionally "not easy to predict" as a security measure. "All of the emails that he sends will be archived," Earnest said at the time.
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I keep telling you to 'Research More Before Posting'...you're not quick on the uptake.


Link: https://time.com/6310241/joe-biden-email-alias-vice-president/