P4Jenkins is displaying the error message:

Unknown Client:jenkins-${NODE_NAME}-${JOB_NAME}-${EXECUTOR_NUMBER}

when using the suggested default user name that includes variables. For example:

If there are variables in the workspace name the check should be skipped.

Reproduction Steps:

(1) Create a freestyle job.

(2) Add a Source Code Management "Perforce Software" block.

(3) Set a credential and fill out the 'View Mapping' with a classic depot path (not a stream). Do not change anything else. This leaves the 'Workspace name' set to 'jenkins-${NODE_NAME}${JOB_NAME}${EXECUTOR_NUMBER}'.

(4) Save the job.

(5) Click 'Build Now'.

(6) Click 'Configure' again and scroll down to the 'Workspace Name Format'. The error is seen.