Are you try ing to mix them in co term? Q: Can I mix MR Enterprise and MR Advanced licenses in a co-term organization? A: No, all MR licenses must have the same edition (MR Enterprise or MR Advanced) across a co-term organization. You can use MR Upgrade licenses to convert your existing MR Enterprise licenses into MR Advanced licenses and convert your organization’s Product Edition from MR Enterprise to MR Advanced. https://documentation.meraki.com/General_Administration/Licensing/Meraki_MR_License_Guide#Co-term_Licensing_Model_FAQ
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