I see all the major vaccine producers, BioNTech / Pfizer, Oxford / Astra-Zeneca, and Gamaleya / Sputnik have production problems, it's not something unique to either Argentina or Russia. Contracts aren't defining the supply situation right now. We're going to have to live with that for a while.
Argentina hasn't done badly in the vaccine scramble, it seems the country has got an effective vaccine, even if it's not arriving in the quantities planned. It would be worse to be in the situation of Chile, having got a few doses of BioNTech / Pfizer for show, and now scrambling for a possibly 50% effective Sinovac.
And thanks also to Graciella, this is a very informative thread.