We have an issue with Person/Group fields in an Events Calendar, where if the full name is entered 'Ken Kenniff' then it resolves fine. However if the username is entered 'kkenniff' then it doesnt resolve (No exact match was found error).
Additionally the autocomplete does not work, i.e. no suggestions as the name is typed.
We have a number of lists which have person/group fields and work perfectly well. Any ideas why this would not work on a particular list (Calendar in this instance)?
The only difference I can note is that the Calendar has workflow.