Hello @Jeremy Duffy ,
Welcome to Microsoft Q&A forum.
Looks like connecting the alternative account to Azure credits should still work.
Though I think there’s no limitation on personal accounts for connecting to Azure credits, compare their personal accounts with your alternative account, do you see some differences maybe(such as newly created, associate with other things…)?
As your question is more related to billing/subscription and Azure Subscription platform, I helped add Azure
related tag, and would also recommend you double confirm this with Visual Studio Subscription Team here: Visual Studio Subscription Support, or create a support case here: Get help.
Sincerely,
Tianyu
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