Hi Alan,
Thanks a lot for your query and we are so sorry about the trouble this must have caused.
We are sorry but fetching an image field from ACF for showing as a featured image is not available.
With that said, I don’t think that option is available in any SEO plugin but I could be wrong.
Moreover, there is a workaround where you can automatically set your ACF image as a featured image which will then be picked by Rank Math:
https://support.advancedcustomfields.com/forums/topic/set-image-as-featured-image/
Hope that helps and please do not hesitate to let us know if you need our assistance with anything else.
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.