What's the bet it is something to do with MAC randomisation.   The Android starts off using a private MAC address, gets a DHCP address, and then changes to a non-private MAC.  That would make it look like two different MAC addresses where trying to use the same IP address. ... View more

Have you tried disabling the random MAC of the devices?   To be honest, it's difficult to suggest something without knowing your network, so you can start with a packet capture to try to analyze the root cause of the problem.   In any case, I suggest you open a support case. ... View more

Any device reaching out to the router will be tracked, so if you set an incorrect gateway and have a static IP then they will likely not be seen. ... View more

@bxdobs wrote: Please Disregard my previous posting ... tried another machine which had exactly the same results with W10 Pro 64b   Turns out in this case the 691 error was CORRECT ... there may be an issue with the Meraki Dashboard used from the latest Firefox browser ... I explicitly CHANGED the PW for the VPN User to something simple as a temporary test ... this temporary password apparently wasn't accepted by the dashboard ... don't recollect seeing any error message when I pressed the change button so will take a closer look at this as a possible issue   Anyway I have now put back the original PW and reset all users ... all working now      I've caught myself before by thinking I've hit save when I haven't, when the save button is all the way at the bottom of the web page. I feel your pain. ... View more