"If the peer assessment block is used in conjunction with the sign-off block, the portfolio author must sign off the page before anybody other than themselves and the peer assessor can see published peer assessments."
So that is the way it should be working - but currently isn't
The manual mentions:
"If the peer assessment block is used in conjunction with the sign-off block, the portfolio author must sign off the page before anybody other than themselves and the peer assessor can see published peer assessments."
So that is the way it should be working - but currently isn't