Remaining Estimate and Time Spent not available in board Estimation

[Sarah Gearinger]

Hi, I'm looking to set up a Jira board that uses "Remaining Estimate and Time Spent" as the estimation metric for planning. I'm following this article: https://support.atlassian.com/jira/kb/how-to-view-remaining-time-estimate-on-issues-from-backlog/

However, I don't see the "Remaining Estimate and Time Spent" radio button as described in this article and other support questions. Screenshot of my settings options below.

I've already confirmed the following:

1. This is a company managed Space
2. This is a scrum board
3. Global time tracking is enabled
4. Time Tracking field is available on all screens

So, what I need help with, why isn't "Remaining Estimate and Time Spent" available in my board settings under Estimation?