Try to download any free game or demo from ps store and you should get the same error.
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So as we can see in php script example here
https://vitadevwiki.com/vita/Act.dat Vita Activator and any others like epsp v3.1, fill http headers with data and trying to fetch act.dat from
https://commerce.np.ac.playstation.net/cap.m
But by some reason get reply with code that is corresponding to invalid IDPS.
if (strncmp(hdr_val, "NG; reason=24", 13) == 0)
succ = ACTIVATE_INVALID_IDPS;
As we all use spoof to 3.65 and real 3.65 vita activate no problem, I suppose we got bans...