Does anyone have a good C# example for updating a cell with the v4 API?
I have the get cell values c# example from the developer website working with Google Sheets A
I think you just have access to read your sheet because I can see :
static string[] Scopes = { SheetsService.Scope.SpreadsheetsReadonly };
Try to change "SheetsService.Scope.SpreadsheetsReadonly" by "SheetsService.Scope.Spreadsheet" or by "SheetsService.Scope.Drive". Maybe it's another syntax... If it's not a problem of authorization I can't help you, sorry... Good luck my friend.
Ps: On Xcode (objective-c) you must reset the simulator after modification of scope. For you (C#) I don't know.