I’ve got the same problem…
I had four stages to make up, of which I completed three over the weekend and promptly received an e-mail upon finishing each as usual.
All I had outstanding was Stage 2, for which I completed the February 4th 21:05 GMT session tonight. However I’ve had no e-mail, the jersey hasn’t unlocked and when I look on the Tour de Zwift website, the tile says I’ve not completed the stage.
Hopefully this is a bug that can be amended, as it’s a bit of a downer to have spent the time doing the tour, only to not really finish it due to some technical problem.