In order to grant permissions to an app, the owner role is required.
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Click on Subscriptions
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Click on your subscription
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Click on Access Control (IAM)
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Click on Add → Add role assignment
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Click on the search box & enter the role name as Reader role
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Select the role & click next
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Click on Select Members
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Enter the App name (which you have created in Step-1: Create Microsoft Entra ID app ) & Click Select
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Click Next
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Click Review + assign