Would it work to say "[a/the] Tanzanian town" here? It isn't accepted, and I haven't reported it.
I was thinking the same, but since the direct translation is "the town of Tanzanians", I think it's also the meaning. Let's say the town is located in Kenya, but it's full of Tanzanians. Then it is a town of Tanzanias, not a Tanzanian town :)
There was no audio. So it was impossible to correctly answer this question.