Hi I am facing below error when I am trying to connect my project with salesforce org

I want to mention that this solved my issue when trying to connect a console application developed with C#,  I was getting access denied after authenticating with salesforce and my application was unabled to connect. 

I unchecked the box Require Proof Key for Code Exchange (PKCE) Extension for Supported Authorization Flows on my connected app as someone previosuly mentioned.