Unable to raise Premium Support tickets via support portal

Partners with Premium Support products may not be able to create ticket for paid Microsoft 365 Product Tickets and receive a 400 error.
We are currently investigating this incident.

The current workaround is to open these support requests via the following Support Portal instead:
https://alsosupport.atlassian.net/servicedesk/customer/portal/300

We apologize for the inconvenience.