Hello,
Thank you for contacting Rank Math for help with making your external links doFollow.
Please verify that the default setting for outbound links is set to follow. To do this, navigate to Rank Math > General Settings > Links and next to ‘nofollow external links’ make sure it’s toggled off Then click the save changes button. Screenshot:

Hope that helps. If you have questions, do not hesitate to ask.
thank you.
the issue has been resolved.
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.