We have the same issue! We use API calls to automate daily guest MerakiAuthUsers. You'd figure you'd want the same guest SSID and users across the organization or at the very least the ability for them to auto sync across the organization. However, as specified if you make the user on the network 1 via API, it doesn't show in the get Merkai users list for network 2. However, it does show in the GUI Dashboard for network 2! This prevents us from using a second API call to authorize the user for network 2. What is so aggravating is you can auth the user for network 2 in the GUI but not the API. I figured since the user isn't listed in a get Meraki auth user for network 2. That I could then make multiple API calls to make the user on each network......not so fast it says it already exists. So Meraki API doesn't see users from other networks but also does.....
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