What I did: I bought the premium for macos and ios and use across all device: my macbook, my phone, my iPad
What happened: the calendar added by gmail to my iphone calendar and shown in Agenda iPhone, not shown in Mac and ipad
What I expected: all sync all device for note, calendar, reminder
Things that might be helpful to know (Agenda version, OS and model, etc):
Macbook air
iPad pro 11
Iphone XS Mas
all ios update to lastest version