Hello,
Thank you for contacting the support, and sorry for any inconvenience that might have been caused due to that.
Yes, Rank Math is fully compatible with multisite. Please refer to our guide here: https://rankmath.com/kb/installing-rank-math-on-a-multisite-environment/
As for the username, our website doesn’t have the feature to change your username on the account’s page at the moment.
We can however change your Rank Math account username for you.
I have forwarded your request to our accounts department to help you with changing your username here.
Looking forward to helping you.
Hello,
We have changed the username to evdemon13 per your request.
Hope that helps and please do not hesitate to let us know if you need our assistance with anything else.
Hello,
We are super happy that this resolved your issue. If you have any other questions in the future, know that we are here to help you.
If you don’t mind me asking, could you please leave us a review (if you haven’t already) on https://wordpress.org/support/plugin/seo-by-rank-math/reviews/#new-post about your overall experience with Rank Math? We appreciate your time and patience.
If you do 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.