Hello,
Thank you for contacting us and sorry for any inconvenience that might have been caused due to that.
It seems that you’re currently using the Rank Math PRO plugin, but the account you have used to open this ticket is the Rank Math free version.
Can you please search and forward a receipt from FastSpring.com so we can locate your account and verify it?
Back to the issue, we’ve checked your page with Google’s Rich Results Test and we can see that the schema is validating fine.

https://search.google.com/test/rich-results/result?id=TCMhGupAHZMA5NcEc8sFow
If you’re facing this issue on your GSC account, please try to clear your website cache including any server-level cache, and revalidate the issue there. Once done, give Google some time to recrawl your site.
Let us know how it goes. 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.