Invalid DNS Records

My client is using an Australian DNS hosting service and this is what their support person said:

As for the CNAME record, the provided one, unfortunately, will not work with our DNS hosting as it’ll append the domain name onto the end of each CNAME record, so www would end up as “www” which is an invalid record.
Looking at the support documentation for web flow, it’s not clear what their workaround for this is. You may need to reach out to them and see if they support another form of CNAME records.

Can anybody help me with this?

Here is my site Read-Only: LINK
(how to share your site Read-Only link)

It sounds like they’re confused by what you’ve requested.
For the CNAME, the hostname is www and the value is, not the other way around.

Internally, that hostname will expand to, which is correct.