The easy way I did this was just by setting the attribute "aCSPolicyName" to the SAML role I defined in the Meraki Dashboard. This was an unused attribute in AD that is sometimes used to set ACLs for users. Doing this allowed me to be able to support multiple rules with a single policy. It especially comes in handy if you switch to SP initiated SAML since you have to define the Apps for those in RSA.
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