Hello,
Thank you for contacting Rank Math and bringing your concern to our attention. I’m sorry for the delay and for any inconvenience this issue may have caused you.
Since you mentioned that you’re using CPT, could you please head over to Rank Math > Titles & Meta and look for the CPT which should show the Add SEO Meta Box option

And from there, you can add the image for your open graph tags in the social tab individually:
https://rankmath.com/kb/meta-box-social-tab/
Please note that some options are only available when you enable the Advanced Mode in Rank Math. If it’s not showing, you must have chosen to use the Easy Mode. Please follow the steps in this link to switch to Advanced Mode:
https://rankmath.com/kb/advanced-mode/
If that didn’t help, could you please share the affected URL to further check this issue? You can add it in the sensitive data section

It is completely secure, and only our support staff has access to that section.
I hope that helps. Thank you, and looking forward to your update.
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.