Thanks to everyone for the help! After a few more failed attempts at the MC, because I had somehow managed not to activate my BB even after trying online, I was able to load both a $500 vanni and $99 from a OD VGC. Since BB free reloads are dying at WM, I've also ordered a Serve so I can switch to that soon, and will try some local FD to see if I can load anything to BB there.