DNS/domain_ownerについて、ここに記述してください。

How to Find a Domain Name Owner https://www.domain.com/blog/2018/11/13/find-a-domain-name-owner/

1. Google

SiteGround: Verify your domain https://support.google.com/a/answer/6169597?hl=en

Verify your domain with a TXT record

https://support.google.com/a/answer/183895?hl=en

Verify domain ownership https://support.google.com/a/topic/9196?hl=en&ref_topic=2426592

How to set up Google Search Console domain verification for site-wide reporting data Getting technical: What you need to know about verifing your site with GSC using a DNS TXT record entry. Detlef Johnson on March 5, 2019 at 8:08 am

https://searchengineland.com/how-to-set-up-google-search-console-domain-verification-for-site-wide-reporting-data-313256

GoDaddy: Verify your domain https://support.google.com/a/answer/182475?hl=en

GoDaddy® domains can usually be verified automatically in the Google Setup Wizard.

2. GoDaddy SSL 証明書

https://jp.godaddy.com/help/htmldns-7452

SSL証明書を要求する際、弊社は、証明書の要求対象となっているドメインがお客様によって管理されていることを検証するよう、お客様に求めることがあります。これを行うために、弊社は以下のいずれかのオプションを提供します。

3. squarespace

https://support.squarespace.com/hc/en-us/articles/205812388-Domain-verification-with-a-TXT-Record-alternative-method-

4. Office 365

Add a domain to Office 365 https://docs.microsoft.com/en-us/office365/admin/setup/add-domain?view=o365-worldwide