Dear Wix, this question is from 2021 and there is still no sollution provided??
With iOS 18 Apple requires that the file https://yourdomain.com/.well-known/com.apple.remotemanagement exists!
Also voor MTA-STS there seems to be no solution.
It looks like there is no other solution then saying farewell to Wix.
We can’t say to all our students and employees that Apple is not welcome anymore in the building. Only android and this because we use Wix as webhosting for our website.
Without saying goodby to Wix I only see one solution.
Getting an other webhosting solution beside Wix and change de DNS settings.
Pointing https:// domainname .com to the new hosting solution and https:// www.domainname .com to the wix website. And placing a redirect on the new hosting solution zo it translates https:// domainname .com/index.html to https:// www.domainname .com
It doubles the hosting cost for only one or very small text 2 files. But it should work.
Then we can bypass the flaws in Wix. But it should not be necessary.
The .well-known folder is very well known and used many years on the internet.
Only Wix does not recognize the existence and needs of the folder. 