There’s nothing we can do with the amount of information you gave
Googling for Promise rejection NotAllowed Error
gives some pointers, you could check with your applications code: https://www.google.com/search?q=promise+rejections+NotAllowedError&oq=promise+rejections+NotAllowedError&aqs=chrome..69i57.9583j0j7&sourceid=chrome&ie=UTF-82
Browsers reject a lot of things:
- mixed content (http sources in a top-level https page)
- our Content Security Policy allows only certain JS actions and resources on the page
- cross-origin requests
I can only speculate without knowing what your application does and its code.
Ralf