Hi C_S2020,
I would suggest contacting Qualtrics Support to confirm, but my guess is that the missing labels are an inherent limitation of making that type of question compatible with a Mobile view.

C_S2020,
MatthewM is correct. Scale labels aren't displayed in mobile (aka accordion) view.

OK thanks MatthewM and TomG for the info.

C_S2020 I am new to using Qualtrics and was having the same issue. When I was searching for a solution, I came across this post as well. I realize it's a month old and you may already have a workaround or solution, but I'll share mine that I came up with in case it will help.
Basically, I use the labels and I also put the text in my scale with my numbers. But, I condition the text to only show for Mobile view. It ends up looking like the below...notice on the mobile view the first scale point is "1 - Not at All Satisfied"...but on the desktop view all you see is "1" because the " - Not at All Satisfied" will only show for mobile.
Someone who knows CSS better could probably improve this, but in the custom css box under Look & Fell I have this:
  .mobileShow { display: none;}
  /* Smartphone Portrait and Landscape */
  @media only screen
  and (min-device-width : 320px)
  and (max-device-width : 480px){ .mobileShow { display: inline;}}

Then, my scale points looks like this:
1

bradr636 thanks so much for your advice. That is the perfect solution to my problem. Much appreciated!