Firebase not working on my website when opening from mobile devices

in my website Signup page, i'm using firebase auth for web ( @angular/fire version for angular websites ) to signup a user using Google Signup, i'm doing this using the SignInWithPopup function.

this is my AuthService class :

@Injectable({
  providedIn: 'root'
})
export class AuthService {

  constructor(
    private afAuth: AngularFireAuth,
    private http: HttpClient
  ) {}

  private readonly api_url: string = environment.apiUrl

  async googleAuth() {
    return await this.afAuth.signInWithPopup(new GoogleAuthProvider())
  }

  etc ...

and using it like this in signup.component.ts :

  googleUserSubmitted() {

    this.loadingGoogleUser = true

    this.signupWithGoogle()
      .then((res) => {

        res.user?.getIdToken()
          .then((token) => {

            this.googleForm.patchValue({
              email: res.user?.email,
              name: res.user?.displayName,
              tokenID: token
            })

          })
          .finally(() => {
            this.loadingGoogleUser = false
          })

      })
      .catch(() => {
        this.loadingGoogleUser = false
      })
}

this function works normally on my laptop when using chrome or firefox browser . but the problem when i try to signup form my android device, I've inspected the console using USB debugging to see what errors I'm getting when doing so. and I saw the following :

Access to XMLHttpRequest at 'https://www.googleapis.com/identitytoolkit/v3/relyingparty/getProjectConfig?key=MY_API_KEY_HERE' from origin 'https://sakostore-bd7ad.firebaseapp.com' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.

what I tried to solve this problem and sadly not working :

• I've tried Huawei and Samsung mobile devices the problem is the same
• I've checked the Authorized Domains in Firebase Console and its listed correctly
• I've allowed third party cookies and popups

some context to help you understand the problem :

• this is the domain of the website http://77.37.125.123/ ( note there is no SSL applied )
• I'm using Hostinger VPS, with nginx, This is the config file : click here to see the file

I Found The Solution Finally . i forgot to try to connect to a VPN. while living in syria there are some restrictions when connecting the website with the firebase web app instance. my mobile devices was not connected to any vpn . so GoolgeAuthProvider() neither any firebase service was not working . it appeared to be a region problem