I'm struggling to get a filter working on a sharepoint list. I'd like the flow to return all events that happen in the next hour;

this filter doesn't seem to return any items;
EventDate gt '@{formatDateTime(utcNow(),'yyyy-MM-dd hh:mm:ss')}' and EventDate le '@{addhours(utcNow(),1,'yyyy-MM-dd hh:mm:ss')}'
the EventDate output looks like this if I use no filter;
"EventDate":"2021-06-09T10:00:00Z"