Microsoft for Startups Preview — How to contact Program Support when "Your Microsoft Team" is missing?

We recently joined Microsoft for Startups through the new Azure Preview portal. Our dashboard shows $200 in Azure credits and offers business verification for up to $5,000.

However, the documented "Your Microsoft Team → Get program support" option is completely missing.

We also raised an Azure support ticket under Subscription Management → Benefits - Offers → Sponsorship request, but Microsoft replied that our enquiry falls outside Azure Billing Support's scope.

We need Program Support guidance on two matters:

Business verification: We're an Australian startup awaiting company incorporation. Can we verify our business later without losing our existing enrolment or future eligibility?

Existing Azure environment: Can our startup sponsorship subscription be associated with an existing Microsoft Entra tenant, rather than having to migrate or rebuild our Azure infrastructure?

Our main question:

How can we contact Microsoft for Startups Program Support when the documented support option is missing and Azure Billing Support cannot assist?

Could a Microsoft moderator provide a working alternative contact method or arrange a private escalation?

Thank you.