Hey Fernie,
It would take some more information typically to troubleshoot via the Community page and it might be best to open a support case. That being said, error code 17 is an IEEE 802.11 error code which means: Association denied because AP is unable to handle additional associated stations
This will typically happen in Meraki devices when client balancing is enabled and the AP tries to steer it to another AP but perhaps it fails to roam or doesn't support 802.11v . What happens if you disable Client Balancing under the Wireless>Configure>Radio Settings page as a test.
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