[Web] Redirect page does not close after successful sign-in with Azure B2C web page

[KeeganDC]

Issue Description

I'm facing an issue on the web platform where the redirect page does not close automatically and returns control back to my app.

if (_interactionMode == B2CInteractionMode.REDIRECT) {
        var result = await _b2cApp!.acquireTokenRedirect(RedirectRequest()
          ..scopes = scopes
          ..authority = _getAuthorityFromPolicyName(policyName)
          ..loginHint = loginHint);
        return; //redirect flow will restart the app
      } else {
        var result = await _b2cApp!.acquireTokenPopup(PopupRequest()
          ..scopes = scopes
          ..authority = _getAuthorityFromPolicyName(policyName)
          ..loginHint = loginHint);

result is never returned for both acquireTokenRedirect & acquireTokenPopup

I have integrated the B2C flow and JSON config into my Android + Web app, and everything works fine except for this specific issue. Upon signing in, the redirect page does not close automatically, unlike on Android.

Please let me know if there is something I have missed or if any configuration or implementation steps could be causing this behavior.

[KeeganDC]

after tracing the code, it seems that _convertMsalPromise never finished/returned a value which is called by acquireTokenRedirect and acquireTokenPopup

not sure why this is happening on web