My JSFiddle is here:
https://jsfiddle.net/h2kf5ztq/
I've largely tried to reproduce balexand's answer from:
How to enable bootstrap tooltip on disabled button?
including, importantly, the CSS:
.tooltip-wrapper {
  display: inline-block; /* display: block works as well */
  margin: 50px; /* make some space so the tooltip is visible */
}
.tooltip-wrapper .btn[disabled] {
  /* don't let button block mouse events from reaching wrapper */
  pointer-events: none;
}
.tooltip-wrapper.disabled {
  /* OPTIONAL pointer-events setting above blocks cursor setting, so set it here */
  cursor: not-allowed;
}
But for some reason, my disabled button doesn't have a tooltip.
How do I enable the tooltip?