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Trying to add an Azure Classic component to my stack which is mostly Azure Native components, I've configured the required `azure:*` auth settings for the same service principal that `azure-native:*` uses, but I'm getting the following error:
```error: failed to load application credentials:
    Details: 1 error occurred:
        * A Subscription ID must be configured when authenticating as a Service Principal using a Client Secret.```
`azure:subscriptionId` is _definitely_ configured, could this error be masking something else? Is there an issue with running Azure Native and Azure Classic side by side?

Ah, found the issue, the docs are incorrect. The docs state the config key as `azure:subscriptionId` when in fact it needs to be `azure:subscriptionID` (capital D)

Here's a PR to fix the docs: <https://github.com/pulumi/registry/pull/1490>