Hello,
We apologize for the issue you are facing regarding your username change. Since you have confirmed that your desired username is available, you can open a ticket requesting the Rank Math Support team to change your username for you.
To do this, please follow this link: Open a ticket.
Thank you for raising this concern, and we look forward to assisting you further!
Sources:
How to Change Your Username in Rank Math » Rank Math
Hi,
Can you please let me change username of my profile. I have checked, my required username is available.
Thanks!
Hello,
Thank you for contacting support.
Please let us know what is the preferred username so we can verify and make the changes.
Looking forward to hearing back from you.
Hello,
Sorry, but that username is already taken. Please suggest another so we can set it to your account.
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.