No 'all visitors' remarketing list
I'm trying to setup remarketing tags on a client site using google tag manager. I'm running into a problem though when GTM asks me for the conversion ID. It says to go to Shared Library > Audiences, and that there will be a 'All Visitors' list in there which I need to get the Conversion ID from.
The problem is when I go to Shared Library > Audiences, there is no 'all visitors' list, it simply says 'No audiences match all the filters', but I don't have any filters.
I'm probably missing something simple, but I can't figure it out. Any help would be greatly appreciated.