How do I get past Azure app verification with a Blazor SPA where my microsoft-identity-association file cannot be found by the verification tool?

Question

Hello,

I am trying to verify two app domains in registrations on the Azure App service. When I go to Branding and Domain and try to verify my new domain it fails. The app I am verifying is a Blazor SPA that I can definitely see the file and folder in the file structure on the server, but when trying to access it remotely / through the browser / through the verification tool it fails.

Is anyone able to advise how I verify the app if it cannot see the folder, presumably because of Blazor's routing?

Thanks in advance