Depending on your location, you can simply configure this in the Meraki portal for guest users. https://documentation.meraki.com/MR/MR_Splash_Page/Splash_Page_Details_for_Meraki_MR#SMS_Splash_Page    If this is for a WPA2-Enterprise mode network - no one does this.  Every time you roam you would need to re-do your MFA.  It would be very annoying. ... View more