Hello,
Thank you for contacting Rank Math, and sorry for any inconvenience caused.
Can you please share the Raw Response from the Indexing API?

Click on Send to API and then click on the Show Raw Response button.
You can add the screenshot in the sensitive data section of this ticket.
We look forward to helping you.
The problem fixed itself today. Thank you.
Hello,
We are super happy that the issue has been fixed.
If you 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.
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.