Thank you for your patience while this was being resolved.
The issues affecting Microsoft 365 services have been resolved. Customers will be able to continue using Microsoft 365 services without any error messages.
Microsoft 365 users may receive the following error message: "AADSTS90033: A transient error has occurred. Please try again." when attempting to access their Microsoft 365 services. Microsoft are currently investigating the issue and working to resolve this.
Microsoft are updating users through their status page here: https://status.office.com/