Problem to copy between teams sharepoint, site not listed

I am unable to copy stuff between brand new Teams Sharepoint(one class teams and one staff teams). With an another account, we are able to copy to an old(2 years) class Teams. What's is wrong with new Teams Sharepoint site? I am the owner of both the source and the destination. Using the web UI, there is no difference in the parameter of the two new site and the older one. The problem is that thoses sites aren't listed in the side pane to choose the destination even if I click show more