If I had to bet on it, my guess is that our AXL Datawarp code does not work. I think it was ported over from SCR to AXL but without testing, since we don't have a machine where we can easily test it. It's possible that ECP users at LANL or NERSC might want it, and I'm not clear on Datawarp status on upcoming systems.
Let's ... either refresh Datawarp or decide to drop it. If we decide to keep it, we can auto-detect it during the AXL build like BBAPI.
This issue stems from a discussion in https://github.com/LLNL/scr/issues/288#issuecomment-821515244
As mentioned there: