Unauthenticated Access to Maps Not Working But Authenticated Access is

I have a map in AWS Location Service and a React frontend with mapbox-gl. When accessing this resource as an authenticated user everything works fine. The attached policies for the unauthenticated role have the same map permissions and yet unauthenticated access does not work. The role has other permissions too for appsync and these do work in both the unauthenticated and authenticated cases which indicates that the role is being assumed in both cases. The error message when trying to access the map as an unauthenticated user states that the user assumed the correct unauthenticated role but was not permitted to access the map but as far as I can tell they are (same policies as authenticated role which works). Could the problem be that my Cognito resources are in eu-west-2 (London) and the map is in eu-west-1 (Ireland) ? If so, not sure why it works for authenticated access. If this is the issue, any idea when the service will be available in eu-west-2?