Issue when trying to register an app for consent screen in google oauth

I am trying to register my app for Oauth consent screen, so that I can create a OAuth client ID. I keep getting this validation error at end of the form, even though I have submitted everything correctly.

An error occurred while saving your app

And this error does not state which input in the form is invalid. Also in the network tab of development tools window, everytime I submit the request, I can see a POST request being initiated and it fails with following error.

{"error":{"code":3,"message":"The request failed because one of the field of the resource is invalid.","details":[{"@type":"type.googleapis.com/google.rpc.PreconditionFailure","violations":[{"type":"client_auth_config","subject":"?error_code=9&error_field_name=UpdateBrandWithMaskRequest.brand_id&error_field_value=0"}]}]}}.

Any suggestions on how to fix this is highly appreciated. I have contacted the google support about this issue as well, but as of now they're saying everything works on their end and clear cache and cookies but it doesn't work. I have attached here a capture of consent config wizard I'm using as well.

Try adding your support email to Firebase console. Go to firebase console->settings->General->Support Email->Add Email. Now while creating oAuth consent screen add same email id developer contact information as well as support email. It worked for me.