RADIUS issue

Hi all -

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I've been chasing down an issue with RADIUS for a while now, and I feel like I've hit a dead end.

I have a NAC pointing to a NPS server for RADIUS. According to the logs, my supplicant successfully authenticates after a number of Access-Challenges (the NAC logs reflect this as well), but is never actually assigned an IP. Here is an excerpt from the RADIUS logs.

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What do you think I should turn my attention to? Everything looks fine up until the supplicant. Thanks!