Hello,
Thank you for contacting Rank Math and bringing your concern to our attention. I’m sorry for any inconvenience this issue may have caused you.
We’ve tried using emojis on our test install, but it seems to be working fine

It seems like your database doesn’t support adding emojis.
Please talk to your web hosting provider, as they might be able to fix this issue with your Database.
However, there is another option to add an emoji in your title & description. Instead of using emojis directly on your site, you can use the HTML version of the emojis in your title & description.
Here is a tool that can help you convert emojis in HTML: https://www.online-toolz.com/tools/unicode-html-entities-convertor.php
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.