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Cisco 3850 MAB problems on some ports

Hi,

We're running 20 stacks of cisco 3850 with IOS 03.03.00SE. As a part of the project, we started migrating the authentication services from an old ACS to a new ISE. We are running 802.1x for the laptops and MAB for the Cisco IP Phones

On the first day, we've migrated 5 stacks and almost everything went fine, excepting 3 IP Phones (different models) which didn't autenticate. We've debugged but no messages came up on the switch. After that, we reloaded the stack with the same configuration and the phones successfuly auhtenticated

For now, the problem is solved, but we still have to migrate 15 stacks and the costumer is afraid of that happening again

What might be the problem? I can't find anything in the release notes

Thank you

Regards

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