[Hubs] Update Documentation Concerning Required Resource Provider Registration

[AErmie]

⚠️ Problem

After deploying v0.8.0 of the FinOps Toolkit (in "private" mode), granting the Azure Data Factory Managed Identity "Department Reader" permissions at the Enterprise Agreement level, and updating the settings.json file; running the config_RunBackfillJob pipeline fails

🛠️ Solution

If the Microsoft.CostManagementExports Resource Provider needs to be registered in the subscription that has the Storage Account, either the deployment of the FTK should include this, and/or the documentation needs to be updated to include this as a prerequisite.

ℹ️ Additional context

Looking deeper into all other pipelines, discovered the following error message on the config_ConfigureExports pipeline:

Operation on target ForEach Export Scope failed: Activity failed because an inner activity failed; Inner activity name: Create or update open month focus export, Error: {"error":{"code":"400","message":"RP Not Registered. Register destination storage account subscription with Microsoft.CostManagementExports. Please refer https://docs.microsoft.com/en-us/rest/api/resources/providers/register"}}

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[flanakin]

Hmm... This is strange. I was under the impression RP registration is automatic when creating exports. Thanks for reporting this!

[timja]

We hit this as well FYI.