Are you local to the switch do you get the same results if you use the console port?
you can try this;
does requires a couple of reboots
It is not possible to stack a X620 with a X690.
You could stack a x620 with a x670, but you are then limited to the resource of the x620 specs.
try this link to the stacking tool
Since slot two is the "backup" it needs to have the same license as the master. Backups are the next Master in the event of a Master fail.
Removing the license should clear the error;
Command: Clear License * you may need to hi...