Have you tried shutting down MAMP entirely? It seems like there’s a DNS conflict somewhere on your system
If you’re open to non-Lando alternatives, both Trellis w/ Lima and Laravel Valet/Herd are also really great options. There’s also folks that are using DDEV with Radicle, but that’s Docker based as well and you might run into the same issue that you’re experiencing with Lando.
I would assume from another local dev tool but I can’t be entirely certain. It seems like you’re hitting this issue but there’s not any real solutions
You can use Trellis just for your local development (or even just for deployments) — it doesn’t need to be all-or-nothing with Trellis and folks are using it in all sorts of different ways depending on their needs
That said, I’d probably try out Laravel Herd next if I were you. It supports Radicle out of the box.
I was having this issue today. For me, the problem was the network I was connecting to was preventing the URL proxy from working - connecting to a different network fixed the issue. Leaving the relevant Lando documentation here in case anyone else stumbles onto this thread looking for an answer: