We unblocked ourselves 😉 

https://soapbox.pub/blog/threads-server-blocking/

That being said the federation Threads is currently permitting is super limited, so you won't really have much success talking to people there. You can follow accounts that opt in, but they won't be able to see or engage with you yet. Threads claims these features are planned for the future.

Here's what they say about that:

> "In the future, we expect content to flow from the fediverse into Threads. Federated Threads users will be able to see and engage with replies to their posts coming from other servers, or follow people on other fediverse servers and engage with their content directly in Threads. Our plan is for fediverse-enabled Threads profiles to ultimately have one consolidated number of followers that combines users that followed them from Threads and users from other servers."