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Hi Alex,
We understand this issue has caused a great inconvenience to our SharePoint Online user. We have already reported this issue to our related resources and waiting for their responses.
The reason why Eric suggest the infected user creating a support ticket is because the phone support agent has the correct escalate channel for the SharePoint Online related issues. Since they could help you with a remote session, they could see this issue more clearly, and collect related logs for the escalation, this process couldn't be achieved in the this community. Deeply sorry about this.
If you have created a support ticket, please share us with the ticket number, and we could track on the procedure on this issue and share the updates with all the users in this thread.
Much appreciate for your understanding.
Regards,
Alex Chen