We have not been able to verify your authority to this domain. Error 12.

Here is the solution for your issue with the Error "We have not been able to verify your authority to this domain. Error 12" while adding a Domain name to your Blog.

 

In order to resolve your issue, you need to make sure that you have the following:

1. Up and Running Blog

2. Registered  Domain Name.

Once, you have the above you can go ahead and follow the below steps to fix your issue:

Step 1: Create a CNAME record for your Domain name on your Domain Registrar website:

1. Log in to your Account Manager/Settings.
2. Next to Domains, click Manage.
3. Click the domain you want to use, and then select the DNS Zone File tab.
4. Click the www record.
5. In the Points To field, type ghs.google.com.
6. Click Save, and then click Save Changes.

Step 2: Update the Custom domain name on your Blogger Account:

1. Log in to your Blogger account.
2. From the Settings tab, select Basic.
3. Under your Blog Address, click + Setup a 3rd party URL for your blog.
4. In the field next to http://, enter the domain name you want to use Eg: www.xyz.com
5. Complete any other CNAME entries for verification, if applicable.
6. Click Save.

Once you click on Save you might encounter an error stated in the below image:

As soon as you get this error, go to your Domain registrar website and login to your account and create a CNAME Record.

Step 3: Create a CNAME Record on your Domain Registrar Site:

1. Log in to your Account Manager/Settings.
2. Next to Domains, click Manage.
3. Click the domain you want to use, and then select the DNS Zone File tab.
4. Click on Add Record, select record type as CNAME record.
5. Type Host as provided in my case its: 2xxzyxysyxa and the points to address which is x2vf45fXXXXXXX3.dv.googlehosted.com
6. Finish and click on Save

Once you perform the above step your Domain name will get saved. If it doesn't work immediately, wait for few minutes and then try again.

Moreover, if you would like to redirect your Naked domain name to your website/blog you just have to go to Settings, Basic and then click on redirect yourdomainname.com to www.yourdomainname.com

For your reference, see the snapshot:

Hope this Article help you guys in redirecting your blog to your domain name. Feel free to let me know if you shall have any issues or questions.