We have a serious problem with URL denotation which is affecting not only our organisation but also the wider global community in the field of climate change, which we work in.
Since last Tuesday, any email sent or received by any Microsoft tenant which contains the text string of our URL is marked as Malware due to the URL detonation policy, and sent to the quarantine of the tenant. We have confirmed through multiple experts that there is no malware on the site and that it is not on any blacklists. We have even moved the website to an entirely different hosting provider to rule out issues with the server being blacklisted.
That our own email flow is disrupted is the least of our problems: all Microsoft tenants are afflicted by the same issue when this URL appears in their emails, or any attachments they share, even when we are not a party to the communications.
I have found on blogs from previous years that a handful of organisations have had similar issues, which were resolved after the issue was escalated enough times until it reached an engineer who is able to remove the URL from whatever internal list it has landed on. Microsoft support agents have told us that they understand the problem to be on their side, but they are not responsive or accessible and we are struggling to have the issue escalated.
Can anybody offer advice on either the issue at hand, or on how to force the escalation of the issue within the Microsoft support system? Enormous thanks for any help you might be able to offer.