You can find what you want at the documentation. https://documentation.meraki.com/General_Administration/Cross-Platform_Content/Creating_and_Applying_Group_Policies
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You can try blocking using an asterisk and allowing these addresses. https://learn.microsoft.com/en-us/microsoft-365/enterprise/urls-and-ip-address-ranges?view=o365-worldwide
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Also check the power management settings of the wireless adapter. Some devices are set to turn off the wireless adapter to save power, which can cause connectivity issues.
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I believe that the serial number is only changed if the logic board is changed, if it is another component such as fans, the serial number is maintained.
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Take a look at this. https://community.cisco.com/t5/security-knowledge-base/how-to-configure-a-site-to-site-vpn-between-firepower-and-meraki/ta-p/4048097?attachment-id=187115
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