Norwegian startup Vegalabs says it received $25,060 in Azure credits through Microsoft for Startups and deployed Anthropic's Claude in August for analysis workloads. The company later found itself facing a $17,600 invoice, after discovering that Anthropic models purchased through Azure Marketplace are not covered by Microsoft's sponsorship credits. Microsoft's own Claude deployment guide states that credit-only sponsored subscriptions are unsupported and that accounts with a card on file will be charged instead.
Vegalabs says the sponsorship portal continued to show available credits while Marketplace charges piled up separately, and it deleted the deployment within an hour of noticing the problem. The company acknowledges it did not read the credit exclusions or configure a budget alert. Its card issuer declined the attempted payment over suspected fraud, and $21,168 in unused sponsorship credits later expired on September 8.
Microsoft support told Vegalabs it could not waive or refund Marketplace charges because those transactions go through the third-party publisher's billing pipeline, and that Anthropic would need to authorize any refund. Anthropic support then said Microsoft did not require its authorization and pointed the customer back to Microsoft. Vegalabs reports that four of seven support replies were AI-generated, including both responses from Anthropic, and that some messages misidentified its account as an "Azure Student Sponsorship."
The episode highlights a gap between the way Microsoft presents sponsored Azure subscriptions and the separate billing path for third-party models like Claude. Microsoft and Anthropic each directed the customer to the other, leaving the startup with an unresolved bill and two vendors declining responsibility.