When trying to work with Microsoft Online Services Administration pages at https://portal.microsoftonline.com/Admin, after submitting forms that contain text fields, you might get error:
Sorry! We can't process your request right now.
The service is temporarily offline for scheduled maintenance or we're investigating a problem. We're working to get it back online as quickly as possible.
Error code: 0.
Such form is, e.g., Service Request.
After quite lengthy problem solving session with Microsoft support and bunch of test service requests it turns out that if you have string like <XYZ>
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