Edit message "Change Candidate Email Verification Request"

Summary:

Hello,

I am trying to edit the text of the following message. However, anytime I try to save it, the following error pops up:

Content (please ensure you mask any confidential information):

As you can see I did not make changes to the tokens. Why is this error coming up? I checked the list of tokens and I cannot find the token:

${VerificationPIN}

in the list of tokens. Is this working as designed, e.g. that we cannot change the wording of this message? Or do I have to do something else to be able to edit this message? I dont want to remove the PIN, I just want to change the wording.