Just to let other people know there is the possibility of no trains. I am in Spain and wanted to leave in 10 days to France. I could not find a train. I went to the French train app and it seems they were sold out for 5 days. I went to the train station in Spain to reserve the first available day after that.
I was told there are available seats for purchase but not for global pass holders. And this was true for every day for at least a week.
The result is that there is a two week period where the pass is useless. I ended up buying a full price ticket without the pass and cutting my trip short.
I guess I can come back in a few years to see Southern Spain the next trip.