Try auth_init_client(); in the console or restart your router.If it doesn't work, PM me.
Re-enter your key?
Enable an exception on Malwarebytes for blockland.This could also be due to packet loss.It's obviously not a key revocation. (If that was the case, then the blockland authbar would say ID INVALID on launch)
Malwarebytes does not have an option like this
Put an exception for Blockland (NOT BlocklandLauncher) on Windows Firewall?