The type or namespace 'SharePointOnlineCredentials' could not be found.

Question

How do you resolve this error? I installed SharePoint.Client and SharePoint.Client.Runtime. I referenced Microsoft.SarePoint.Client in my app.

Answer 1

Hi @Ariel M ，
Per my test, please check if you created .NET standard instead of .NET framework. If so you will need to recreate a .NET framework like following

Then we can install CSOM by nuget package

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Answer 2

I added it but there's a yellow triangle with an exclamation mark in it on the reference.