UPDATE 26/03/2019: As you may have observed from the comments on this article, Bethesda’s Morrowind giveaway didn’t exactly go to plan. Users reported several problems with claiming a free copy of the game, including difficulties logging into Bethesda.net and problems with the code system. You may have seen the memes.
In any case, Bethesda acknowledged and eventually resolved the technical problems and has now extended the period for claiming a copy. If you missed out on the first round, you have from now until the end of Sunday 31st March to bag Morrowind for free.
The technical issues have been frustrating, but when all’s said and dunmer, at least we (eventually) got a free game.