Hi Community! Thanks for your post.We are aware of this issue and are investigating it with high priority. Please keep an eye on this thread for updates on the resolution.In the meantime, if you require urgent assistance, please give us a call and on...

Do you have load balancing in place? What is your WAN failover setting?Could be worth looking into those so that the network remains more stable while PPPoE renegotiation takes place. https://documentation.meraki.com/MX/Firewall_and_Traffic_Shaping/...

It may be beneficial to reach out to Cisco Umbrella support, especially if you have already followed the article on the 516 error https://umbrella.cisco.com/support