Can you add some more details to those questions? It’s not possible to get a clear picture of the problem from your first post. Code snippets are helpful. Using clear formatting is also very helpful. It’s difficult to understand what is going on with just an error code and little detail about what is causing it.
The CORS policy usually stems from a request that crosses origins.
Can you post a code block of the call that is returning the 401 error? This is often caused by a setting misconfiguration.
It doesn’t look like it. As I mentioned above, there is no 1:1 replacement for the deprecated sample.