CORS policy error during oauth

Hi, I’m building a web app to integrate into Jira Cloud using oauth.

I’m seeing the following error in my console during the oauth handshake. This is before the user enters their username and password.

Any suggestions as to what is causing this?

Hi,

We would like to investigate this. Could you please raise a ticket in our portal along with as many details as possible like video recording or steps to reproduce?

Thanks.