I am having an issue with being able to download my webmaps in Collector that contain feature services published through Portal. Every time I try to download it so that I can do disconnected editing I get an error message (usually says "Username/password not found"). I am signed in as an administrator and have made sure that all my layers and the map are set up to be synced. In addition, if I go through the same process of publishing to and creating a map in AGOL it works fine. I feel like I am missing a setting somewhere in the Portal Manager but can't seem to pinpoint what it is. Any help would be appreciated.