"Unauthorized" error when fdk preview url is launched

After running the extension sample and when we launch the fdk preview url, we are getting below error.

and also Unknown Application Error coming when we run npm start

Hi @Girish_B

Can you restart the server using command npm run start and check the extension is working or not in platform? There is some access issue.

Still not working, Let me know when your available we can have a call and resolve that.

Attaching the Error Screenshot

Attaching the Router-index.js
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Attaching the env
image