Hello,
Thank you for contacting Rank Math and bringing your concern to our attention. I’m sorry for any inconvenience this issue may have caused you.
I’ve checked the category, and indeed the URL is set to noindex.
For initial troubleshooting, head over to Rank Math > Titles & Meta > Categories and ensure that the robots meta tag is set to index

Then, edit the category page and check their robots meta tag under the Advanced tab if they are already indexed

If the issue still persists, assuming you are using the latest version of all the plugins and the themes (please update if not yet), this could be caused by conflicting plugin/theme.
To determine that, please follow this troubleshooting guide:
https://rankmath.com/kb/check-plugin-conflicts/
Here is a video you can follow as well: https://www.youtube.com/watch?v=FcIWRhcUP2c
Only the site admin would know and your users won’t be affected by this troubleshooting.
Let us know how this goes.
Thank you.
Hello,
Will you please confirm is the issue regarding the current ticket i.e. “Rank Math does not update ROBOTS META for categories” is resolved?
Looking forward to helping you.
Thank you
No it is not resolved yet. I am working on it.
Hello,
Sure, let us know how this goes.
Meanwhile, please don’t hesitate to contact us anytime if you have other questions to assist you further.
Looking forward to helping you.
Thank you.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.