I have the same problem with some equipment after replacing ER7206 router with ER707-M2.

Hello. This morning, three controllers lost access via the Cloud. It shows the status as online, but when I try to log in, the message "Connection failed. Please refresh your browser and try again"...

@Vibis Виртуальные сети делаются на Микротике, а на портах свича назначаете нетагированные и тагированные VLAN