Anyone familiar with Automatic Location Assignments? I enabled the feature and created a roundabout way to call it via a button press (userevent script to render a button conditionally, client script to redirect to a suitelet that invokes executeMacro({ id: 'autoAssignLocations' });) for orders we deem viable for it. I configured a location and created a test order that has one line with one item in stock at the configured location. It fails with an unhelpful unexpected error and no further details. The strange thing is that it works in our sandbox account using the same configuration and test order, but it has also failed on other orders in sandbox in the same way. I can't find any pattern to why it's failing though.

I played with this a while back and it worked well but then I realized there were additional fees if you used it more than just a small amount. I wonder if it could be blocking you in PROD since you don't have a "subscription" to use it.

Good tip, I was able to confirm we have 5000 available uses of it (I think per year, so like you said it's a small amount) so I was using the user event script to narrow down which orders to try it on. I am trying to treat it like a trial to see if it is worth purchasing the higher use tier options.