Hi @Mv , you can do this by navigating to the Function App in the Azure portal, selecting your Function App from the list, then selecting Identity under Settings in the Function App's navigation menu. In the System assigned tab, set the Status to On. Then, select Save, and an Azure role assignments button will appear. Select it, and in the Azure role assignments screen, select Add role assignment. Set Scope to Subscription, select your subscription from the Subscription drop-down, and set Role to App Configuration Data Owner. Finally, select Save.
Please let me know if you have any questions and I can help you further.
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Thank you,
James