welcome to the forum,
when i run the same command, i get a different error, that pcloud does not support the cleanup command.
rclone cleanup pcloud01: --retries=1
ERROR : Attempt 1/1 failed with 1 errors and: pcloud root '' doesn't support cleanup
there are a number of issues with rclone's support for pcloud.
we believe that pcloud changed something on their end.
https://forum.rclone.org/t/recursive-pcloud-root-failure/53622
https://github.com/rclone/rclone/issues/9315#issuecomment-4191795801