It appears as if there's a block in place somewhere.
However, I know that's probably not the case and there's just some mixup in the resolving of AP usernames somewhere in the code.
I'm not 100% knowledgeable about code cause I'm not a programmer, but this exact issue comes up quite regularly with newer AP integrations, so I'm sure it can be fixed somehow.
@BeAware@dave@dave@truefans.social@ChadF please bear with us. We finally got the comment verb to federate on Friday. We will add in other verbs like play/listen, follow and like. We will allow you to reply to comments from your AP client and show the replies inline with the original comment inside TrueFans.