You can view the current Meraki vsa's in control, configuration/Vendor radius attributes.How to see and add, is explained in below link.https://emc.extremenetworks.com/content/oneview/docs/control/access_control/docs/c_ov_ia_at_man_config.html?Highli...
There are so many articles written for this error, did you try to search ?One that might be a start, https://extreme-networks.my.site.com/ExtrArticleDetail?an=000077156
Check the message authenticator attribute on the switch settings in Control. By default this is set to required and if the switch does not include it, the request will be silently dropped.
