Hi kids 4 kids Inc,
I can sympathize how annoyed you feel for being passed from this channel to another, and also the AI answer has not yet addressed the issue effectively.
However, it is correct that an invitation is typically sent by an existing admin, but when that system fails or you don't know who that is, you still actually have to raise an escalation. Call the Microsoft support line again, and this time, immediately state that you need to escalate a Severity A (or Critical) ticket because you have an active security breach (malware) that originated after a failed support action and you are being blocked from further support by an inaccessible Services Hub.
Besides, contact your Microsoft representative by checking your past invoices or Azure Portal (if applicable). Look for an email from a CSAM or an Account Executive, or whatever with a contact. If you can't find one, use the general support line and insist on being connected to your organization's "Onboarding Center" or "Customer Success" team.
In the meantime, you need to ISOLATE THE SERVER, create a timeline document (list everything you've tried so that it will be easier for the engineer to skip the failed method and make the process faster), also prepare for a recovery operation because of the malware infection and the broken state of Command Shell and Webmin.
That's what I could offer. You need to act fast because the later you action is, the worse the situation gets.
I hope you find something hopeful in this message. If you do, it's appreciated to accept the answer as a way to share your valuable experience with the community. Thank you :)
Vivian