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Because it is not made in Germany. Pfizer is responsible for producing it and their plants are primarily in the US.

The Pfizer-Biontec being used in Europe is, generally, produced by Pfizer (and Biontec) plants in Europe.

I don't think that's the case, the US isn't exporting any vaccines afaik and the EU doses are primarily produced in Europe.

The manufacturing of the vaccine is a three-stage process[0]:

The First stage is done in the US.

The second stage is done in the US and Germany.

The third stage is done in the US and Belgium.