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Could you please verify what type of RBAC role is assigned to you?
In order to manage identity validations, the 'Trusted Signing Identity Verifier' role is required. To see the list of supported roles in Azure Trusted Signing, please check the documentation
For your reference: https://zcusa.951200.xyz/en-us/azure/trusted-signing/concept-trusted-signing-resources-roles
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Thanks,
Navya.
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