Terraform plans and applies are completing successfully again. If your plan or apply is in a pending state, it may be stuck and will require canceling and then re-running.
Some number of users will get Error queueing plan invalid run parameters. In this case, make a no-op change on the code in the VCS repo (like adding a comment line) and then committing the change. This will force a new configuration to be pushed out to TFC and execute.