Question: I'm new to from xamarin and I'm trying to publish my app xamarin ios, So when I [try to uploading it to the app store,](https://i.stack.imgur.com/1hDIX.png)
I got the following error.

Answer: 
The error is obvious. It said *Authentication Failed*.

You should sign in with an app-specific password. Create the password at <https://appleid.apple.com>.
Using Visual Studio to upload to the app store works great, if there are no errors. I tend to use [Transporter](https://apps.apple.com/us/app/transporter/id1450874784?mt=12) to check my package and upload instead. You can upload your artifact directly, or from Visual Studio, publish your artifact and save it instead of pushing it to the store. Then use Transporter to check your artifact. The error message will be much more readable ... if there is one.