You need to add an record to your DNS for google site verify : https://toms-caprice.org/add-google-site-verification-record-to-your-domain-dns/

1. Login to the Google cloud console via the following link:

https://console.cloud.google.com/apis/dashboard

2. After login click the “Create Project” button

3. Enter your project name and click CREATE

4. Switch to the tab of “OAuth consent screen”, select the “External” option then click CREATE

5. Enter your info and click “SAVE AND CONTINUE”

6. Click “ADD OR REMOVE SCOPES”

7. Then SAVE AND CONTINUE

8. SAVE AND CONTINUE

9. Check the box and click “SUBMIT FOR VERIFICATION”

10. Go to the tab of ” Credentials ” then click “+Create Credentials”

11. Then click the “OAuth client ID”

12. select the application type: “Web application”

13. Enter a name and a redirect url for this credential

14. Now we got the client ID and client secret

15. the client ID and client secret and redirect url in “Credentials ” tab

16. The last , if your domain verified, now you can publish your app in production