In order to add your site to Google Search Console, you need to get authorized first.
For that, find "Google Search Console" option on the plugin settings page,
1. Open the Credentials page of the Google API Console.
2. Create or select a Google APIs project.
3. Click the “Enable APIS and Services” button.
4. Make a search with “Google Search Console API” and click the “Enable” button.
5. Open the “Credentials” tab, click the “Create Credentials” and select “OAuth client ID”.
6. Configure the OAuth consent screen and click the “Create” button.
7. Fill in the info in the fields and click the “Save and Continue” button.
8. Go back to the “Credentials” tab, click the “Create Credentials” and select “OAuth client ID”.
9. Select the application type: Web Application, Enter the app name and insert Authorized redirect URIs - URI of the Sitemap plugin setting page. Then click the “Create” button.
10. Save the Generated Client ID and Client Secret Keys.
11. Paste the Client ID and Client secret keys that you saved earlier to the appropriate fields and click “Save Changes”.
Then you should authorize and click "Add" button next to the "Manage Website with Google Search Console" option on the plugin settings page. After that, your site will be added to Google Webmaster Tools and verified.
This article related to Sitemap by BestWebSoft plugin
Additional resources: Sitemap - User Guide
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