After you import your provision and cryptographic identity, you need to select the identity which you want to sign with. I guess this is the step you missed to perform which prevents the publishing process. This step is required since there could be multiple signing identities imported.
To select an identity, you need to double click the Properties node in Project navigator and navigate to iOS -> Code Signing Identity and select the signing identity you want to use when publishing.
Please click the following link for complete description of the process:
All the best,
Ivan K. Ivanov
the Telerik team
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