What is the shop or customer experiencing: Shop is unable to set their custom domain and getting an error.

What error messages are there: Error adding domains to service: HTTP request returned status code 409: {"msg":"Duplicate record',"detail":"Duplicate domain: 'glitzglamsass.com'"}

Did you replicate: N/A

What settings were checked: Checked Custom Domain is not setup

Provide Relevant Details: Shop Domain: glitzglamsass.com