Assuming you have started with this document. https://documentation.meraki.com/MR/Splash_Page/Integrating_Active_Directory_with_Sign-On_Splash_Page_For_MR_Access_Points Good place to start troubleshooting might be these docs https://documentation.meraki.com/zGeneral_Administration/Tools_and_Troubleshooting/Active_Directory_Issue_Resolution_Guide https://documentation.meraki.com/MR/Splash_Page/Troubleshooting_Active_Directory_Authentication_issues_with_Splash_Page_using_Windows_Event_Viewer
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