If your traffic is redirecting on your new domain from the indexed old domain, that's fine.

However, if you're worried about duplicate content because the old site has the same content as the new site, that can be a problem if the same page is being indexed on two different domains.

You can tell Google that your domain has changed in the old search console.

1. Make sure both domains are setup in Google Search Console.

2. Set up a permanent redirect on the old site's .htaccess file, redirecting every page to the new site.

3. Search "Google change of address" in Google. The first link above should be from Google Support. Click on that and they will give you a link to the old search console.

4. In the old search console, go to the gear on the far right and click on that. You will see "change of address".

5. Be patient. It can take months before those old URLs are gone from Google.

Just wanted to update quickly. The mistakes in the email links as well as the links to the two company sites proved to be the problem. After recrawling the sites, the 7,000+ errors are gone.

It's interesting because I was about to get very upset with Moz, thinking their bot had caused me half a day of headaches for nothing. Turned out they picked up an error before any other system did that would likely have done a lot of damage given that they were all contact links meant to improve transparency.

Hopefully, we caught and fixed the problem in time. In any case, thanks for your help effectdigital.

I've just come up on something....

In an attempt three days ago to be more transparent (it's a news site), we added "send me an email" links to each author's bio as well as links to the Company and the Agency in the footer.

Except these links weren't inserted correctly in the footer, and half the authors didn't get the right links either.

So instead of it being a "mailto" link, it was just the email which when you hovered over was the url of the page with the author email at the end... the same thing that's happening in the errors.

Same for the footer links. They weren't done correctly and sending users to OURSITE.com/AGENCY1 instead of AGENCY1's website. I've made the changes and put in the correct links. I have asked for a recrawl to see if that changes anything.

Other update here..

I've checked about 50 of these errors and they all say the same stats about the problem URL page.

307 words, 22 Page Authority.

I don't know if it matters, just putting it out there.

True, but it's as if something is creating faux URLs of a current article. Adding company names and emails to the end of the URL... It's very weird.

The referring URL in this case is the original url without the added element in the permalink.

So

URL: OURSITE.com/the-article/COMPANY1

Referring URL: OURSITE.com/the-article/

Does that give any more info?

UPDATE HERE:

I've just noticed that it is also adding the email of the author to the URL and creating an error with that as well.

So, there are three types of errors per post:

OURSITE.com/the-article/COMPANY1

OURSITE.com/the-article/AGENCY1

OURSITE.com/the-article/author@OURSITE.com

Do you mean downloading the CSV of the issue? I tried that and it gives me the following:

Issue Type,Status,Affected Pages,Issue Grouping Identifier,URL,Referring URL,Redirect Location,Status Code,Page Speed,Title,Meta Description,Page Authority,URL Length,Title Pixel Length,Title Character Count.

Which isn't really useful as it relates to the 404 page.

I'm new to Moz, is there a direct line to an in-house resource that could tell us if it's a Rogerbot issue?

Thanks for the feedback. You're right about the 404 part, I should have phrased it differently. As you figured out, I meant that we are getting 404s for URLs that were never intended to exist and that we don't know how/why they are there.

We are investigating part 1, but my hope is that it is part 2.

Thanks again for taking the time to respond.

Hello,

I'm going to try and be as specific as possible concerning this weird issue, but I'd rather not say specific info about the site unless you think it's pertinent.

So to summarize, we have a website that's owned by a company that is a division of another company. For reference, we'll say that:

OURSITE.com is owned by COMPANY1 which is owned by AGENCY1

This morning, we got about 7,000 new errors in MOZ only (these errors are not in Search Console) for URLs with the company name or the agency name at the end of the url.

So, let's say one post is: OURSITE.com/the-article/

This morning we have an error in MOZ for URLs

OURSITE.com/the-article/COMPANY1

OURSITE.com/the-article/AGENCY1

x 7000+ articles we have created. Every single post ever created is now an error in MOZ because of these two URL additions that seem to come out of nowhere.

These URLs are not in our Sitemaps, they are not in Google... They simply don't exist and yet MOZ created an an error with them. Unless they exist and I don't see them.

Obviously there's a link to each company and agency site on the site in the about us section, but that's it.

I've just come up on something....

In an attempt three days ago to be more transparent (it's a news site), we added "send me an email" links to each author's bio as well as links to the Company and the Agency in the footer.

Except these links weren't inserted correctly in the footer, and half the authors didn't get the right links either.

So instead of it being a "mailto" link, it was just the email which when you hovered over was the url of the page with the author email at the end... the same thing that's happening in the errors.

Same for the footer links. They weren't done correctly and sending users to OURSITE.com/AGENCY1 instead of AGENCY1's website. I've made the changes and put in the correct links. I have asked for a recrawl to see if that changes anything.

Just wanted to update quickly. The mistakes in the email links as well as the links to the two company sites proved to be the problem. After recrawling the sites, the 7,000+ errors are gone.

It's interesting because I was about to get very upset with Moz, thinking their bot had caused me half a day of headaches for nothing. Turned out they picked up an error before any other system did that would likely have done a lot of damage given that they were all contact links meant to improve transparency.

Hopefully, we caught and fixed the problem in time. In any case, thanks for your help effectdigital.