Export error from Frame.io panel in Premiere Pro

When I try to export a sequence to Frame.io v4 from Adobe Premiere (Beta)
Version 27.0.0 BETA StaticLib (Build 12) I get a brief error message saying “error exporting sequence”. I then continues to export to a local file (if selected) but not to Frame.io. Obviously I could upload manually, but that’s not good because I want to Upload Markers as Comments, which can only be done directly.