Hello @Ander Sutton ,
Welcome to Microsoft Q&A, thank you for posting your here!!
It could an interim issue, try to create the storage account again through different browser.
Can you please try to create the Storage account using PowerShell or CLI and let me know the status: https://learn.microsoft.com/en-us/azure/storage/common/storage-account-create?tabs=azure-portal
Refer to this section on Validation errors and check if you are seeing any of these.
Additional information: Try to sign up using Chrome and in an incognito window or clear all your browser cache and try using the Edge Browser.
Register 'Microsoft.storage' in the resource providers menu in the Azure subscription. Select the item and click on 'register' on the top of the page.
Please let us know if you have any further queries. I’m happy to assist you further.
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