Meraki RADIUS issues

I am having an issue with one of my remote locations.

It used to do RADIUS authentication in the past, and now it's stopped working.

I have been trying a lot here.

I can ping back and forth, I can reach all i need to. If I change the "secret" to miss-match, I get errors on my NPS server. Meraki support is slow and not much help ATM.

I ran the Meraki Radius Test and i have looked at the packet capture.

12:27:42.416186 IP 192.168.x.x.35072 > 192.168.y.y.1645: RADIUS, Access-Request (1), id: 0x00 length: 145
12:27:42.449504 IP 192.168.y.y.1645 > 192.168.x.x.35072: RADIUS, Access-Challenge (11), id: 0x00 length: 90
12:27:42.450287 IP 192.168.x.x.35072 > 192.168.y.y.1645: RADIUS, Access-Request (1), id: 0x01 length: 348
12:27:43.450308 IP 192.168.x.x.35072 > 192.168.y.y.1645: RADIUS, Access-Request (1), id: 0x01 length: 348

Looks like to me, the Meraki requests, the NPS server challenges, then it's like meraki just drops it or something and duplicates the request.

Any ideas? Not sure why this would stop working, considering my other location is using the same EVERYTHING on the NPS, except the RADIUS client obviously.. but policies etc.. and they work, however this location just stopped?

(no firewall issues or blocking)

Running RADIUS port 1645.

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Thanks in advanced

edit - added pcap