Hello,
I apologize for the inconvenience you are facing with the Meta Box not showing on pages and posts when trying to add HTML content. To resolve this issue, please follow these steps:
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Navigate to Rank Math SEO → Titles & Meta from your WordPress dashboard.

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In the Titles & Meta settings, ensure that you have selected the correct post type where you want to add the missing Meta Box. For example, if you want the Meta Box on pages, make sure to select Pages as shown in the screenshot below:

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Scroll down and enable the Add SEO Controls option in the Titles & Meta settings.

If you have followed these steps and are still facing the same issue, please ensure that you have enabled the Advanced Mode in Rank Math. You can do this by going to Rank Math SEO → Dashboard and enabling the Advanced Mode.
If the issue persists after following these steps, please reply to this ticket, and a human agent from the Rank Math Support team will assist you further.
Thank you for reaching out with your concern.
Sources:
Why Rank Math’s Meta Box is Not Showing? » Rank Math
Rank Math ‘Titles and Meta’ Options and Settings
Fix Excluded by NoIndex Tag – Google Search Console Status » Rank Math
Hello,
Thank you for your query and we are so sorry about the trouble this must have caused.
If you have followed this guide already and the issue persists, please follow this troubleshooting guide: https://rankmath.com/kb/check-plugin-conflicts/
Only the site admin would know and your users won’t be affected by this troubleshooting.
Let us know how that goes. Looking forward to helping 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.