Soulbound Extension + Studio-Deployed Collection

I am trying to make a token collection deployed through Studio (with the Claim Code mint functionality) into a Soulbound/nontransferrable token. I’ve followed other docs and examples for registering extensions, but my registration of the Soulbound extension doesn’t take properly (though the registration transactions aren’t failing).

Here are the deployed contracts:

Is it possible to configure this standard soulbound extension with this Studio collection setup? Thanks!