Apparently, Marvel comics was the one that designated MCU as 199999. These people seem to believe marvel did confirm that designation.
Also, apparently we all didn't read the footnotes, because this is what it says in the Marvel Database Fandom
This universe's official designation was revealed in the hardcover of Official Handbook of the Marvel Universe A-Z #5.
Last edited by TheyCallMeBruce; 05-14-2019 at 08:44 PM.
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