Hello there,
According to the exception, it indicates that there is no related path in the Azure. If it is possible, we could remote debug Azure Web Apps. Then we could get the file path. After that we could use the Azure kudu(https://yoursite.scm.azurewebsites.net) tool to check whether the path is existing.
If the file path is not existing, we could drag the folder to the kudu tool directly or we also could publish the folder with Visual Studio. After that, it should work.
Similar discussion here https://learn.microsoft.com/en-us/answers/questions/46900/azure-app-service-not-able-to-find-root-folder-pat
Hope this resolves your Query !!
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