Okta Login Error

Questions OAuth/OIDC
1

I have created SPA using react signInWidget where I am trying to login the the user but getting this error everytime
You are not allowed to access this app. To request access, contact an admin.
When I check network tab its coming like this

  },
   "failure": {
       "name": "failure-redirect",
       "href": "https://dev-47249588.okta.com/login/error/redirect?stateToken=02.id.hXU2IdbURzgyE5nNBIGh2fEQJhoxlShEejtQWh1j"
   }
}

please guide me why I am getting this

2

Can you take a look at the following article that mentions this error code and how it is related to your Authentication Policies (note that you will want to focus on the policy associated with your custom OIDC app, not the Dashboard app): Unable to Access Okta Dashboard | Error “You are not allowed to Access this app. To request access, contact an admin”