According to the user documentation at - https://docs.moodle.org/310/en/Cohorts#Assigning_user-context_roles_to_all_cohort_members
I can create a cohort and assign all members of that cohort specific user rights - such as "Non-Editing Teacher", or "Manager".
However if I try to do that it it will not let me assign the role to the cohort but wants it assigning to users as ...
What am I doing wrong please? Why can I not do as it suggests I should be able to?