Hello,
Thank you for contacting Rank Math and sorry for any inconvenience that might have been caused due to that.
To be able to add a category to the breadcrumb, you will need to head over Rank Math > Titles & Meta > Select the post type and then head over to Primary taxonomy option and select the taxonomy that you would like to be displayed on the breadcrumbs.
Looking forward to helping you. Thank you.
Thank very much, it solved
Hello,
We are super happy that this resolved your issue. If you have any other questions in the future, know that we are here to help you.
If you don’t mind me asking, could you please leave us a review (if you haven’t already) on https://wordpress.org/support/plugin/seo-by-rank-math/reviews/#new-post about your overall experience with Rank Math? We appreciate your time and patience.
If you do have another question in the future, please feel free to create a new forum topic, and it will be our pleasure to assist you again.
Thank you.