Hi there, I've successfully set up SPF/ DKIM for Marketing Automation, but struggling to complete the Custom Return Path. I'm settting up on Wix. What should the host name be for the CNAME record?

In Zoho Help it just says: "type your host name (sub-domain name) – which you've used in your domain's DNS". So I tried the same Host Name I used in the DKIM record, but Wix is giving me an error that this host name is already used in other DNS records (ie. the DKIM record).