Customer doesn't know how to add a switch to the leaf stack.
Below is the procedure of adding a new switch in a leaf stack, the best practice we can recommend is:
1. 1. Remove the stack leaf from the parent switch.
2. 2. Establish the new leaf stack, by adding new member/s (Example for Adding a Member Switch to a Stack (Service Port Connection)).
3. 3. Have the new leaf stack rejoin the SVF parent.