This error usually happens because the "Export to File for Power BI Reports" action in Power Automate only works with workspaces assigned to Premium capacity (not Premium Per User - PPU). Even if you and your workspace both have PPU licenses, the export action is not supported for PPU workspaces—it requires a workspace on a dedicated Premium capacity (SKU like P1, P2, etc.), not just PPU.
Summary/Direct Answer:
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PPU (Premium Per User) workspaces are not supported for Export to File via Power Automate.
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This limitation is by design from Microsoft.
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To use the export action, the report must be in a workspace backed by Premium capacity (not just PPU).
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Your licenses and setup are correct, but this feature is not available for PPU, which is why you see FeatureNotAvailableError and a 404 error.
What you can do:
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Move the report to a workspace assigned to a full Premium capacity (if available).
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Or, use other export methods supported by PPU (like exporting manually in the Power BI Service).