best practice is to use 900 bytes if you have udp fragmentation trouble / don't forget to make the same on Radius side as well:

https://arubanetworking.hpe.com/techdocs/CLI-Bank/Content/aos10/a10-sh-1x-eap-frag-mtu.htm

Description
This command displays the IP MTU to be considered for EAP fragmentation.

(host) [mynode] #show dot1x eap-frag-mtu

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