Well, here is the case: I did build a web application in laravel, used Passport package to build APIs so it can be consumable by another apps. Which works perfectly when Authenticating by Bearer User Token. Now as I decided to consume the same API by new VueJS Front-End, as mentioned here, but it returns 401 code response!
I double checked all the steps, middlewares required to be added to kernel, guards in auth.php and I assured the request is going with all required headers (X-CSRF-TOKEN, X-XSRF-TOKEN,X-Requested-With: XMLHttpRequest).
I even compared it with another application I've done (which is working perfectly) and it was the same request.
Do anyone has a clue where else to check?