Hello,
Thanks for contacting us, and sorry for any inconvenience that might have been caused due to that.
Rank Math Table of Content works with Gutenberg editor. Just to be sure whether it’s caused by plugin or theme conflict, would you please follow this article: https://rankmath.com/kb/check-plugin-conflicts/.
If it’s theme causing the conflict, I would suggest posting the question to the theme developer.
Looking forward to helping you.
Thank you.
Hello,
Thank you for the additional screenshots.
We might need to take a closer look at the settings. Please edit the first post on this ticket and include your WordPress & FTP logins in the designated Sensitive Data section.
Please do take a complete backup of your website before sharing the information with us.

It is completely secure and only our support staff has access to that section. If you want, you can use the below plugin to generate a temporary login URL to your website and share that with us instead:
https://wordpress.org/plugins/temporary-login-without-password/
You can use the above plugin in conjunction with the WP Security Audit Log to monitor what changes our staff might make on your website (if any):
https://wordpress.org/plugins/wp-security-audit-log/
We really look forward to helping you.
Hello,
I have updated the sensitive data as requested. Can you please check further?
Thank you.
Hello,
Thank you for providing a temporary admin login for us.
All the headings on your post content are H2 headings and you are simply excluding them. To remove them from exclusion, you need to uncheck the H2 option from the “EXCLUDE HEADINGS” option in your block settings:

You can adjust the default settings in Rank Math > General Settings > Blocks:

Hope that helps and please do not hesitate to let us know if you need our assistance with anything else.
Thank you! Sorry to bother you!
Hello,
Glad that helped.
Please feel free to reach out to us again in case you need any other assistance.
We are here to help.
Thank you.