Each track goes through a bootstrapping process to get it prepared for an upcoming recording. If part of this process fails for any reason, then the track will not report itself as being properly initialized. To prevent any potential risk of audio loss, the recording cannot proceed in this case.
The participants tracks encountered a critical error while preparing for recording. This will likely be caused by a failure in a separate health check.
If any of the other health checks have failed, remedy them first and the tracks should then be able to initialize properly. If problem persists, try creating a fresh episode in the dashboard. If you find that this problem persists across multiple recordings and is the only failed check, please contact firstname.lastname@example.org.