If anyone has the same problem. This is what worked for me (from Trainerroad FB profile):
“This happens when there’s a problem communicating with Trainerroad, which is usually solved by logging out and back into the Workout Creator. Also logging into the website could help establish connection.”
Thank you! worked. For anyone else having issues - the problem seemed to happen after I had to update my TR password. I think I had remained logged into WC with my old password, and they couldn’t communicate. Manually logging out of WC and TR and following bryce’s order of operations worked