RE: businesscentral.dynamics.com
Help the community understand - Are you/your users looking for alternative ways to access Business Central SaaS? Whichever way you go, the link will always be businesscentral.dynamics.com
It's like accessing google.com from other websites (it's still google.com, no matter from where you open it from)
Please raise specific issues/errors if you are looking for specific answers
Also, this community is run by professionals from around the world working in Business central and trying to give it back with their knowledge, I doubt you'll receive any "confirmation" of any sort, that too from Microsoft, officially. I'd suggest write to Microsoft Support via your partner/CSP channel