For what it's worth your blog does show up fine in NodeBB as well. Perhaps you are missing the @context property and so Mastodon is refusing to parse it?

silverpill@mitra.social nice job! Congratulations on the release now you must maintain it for free forever.

rwg@aoir.social I'm not actually sure! You'll have to ask reiver@mastodon.social about that one. Let me know too!

quillmatiq@mastodon.social yeah I think I will be! Thanks reiver@mastodon.social for organizing

The mirroring functionality was better suited for NodeBB before it supported remote categories. It's a little redundant now but still has value if the topics are cross-posted instead of moved. Unfortunately cross posting isn't quite available yet (nor have I thought through the various aspects of it). My recommendation for now is to pause category synchronization and use remote categories primarily.

decentered@social.wedistribute.org it's been awhile! Looking forward to it.

reiver@mastodon.social that's the first time I've seen the FediOrigami logo, looks neat!