Hello,
Thank you for contacting Rank Math and sorry for any inconvenience that might have been caused due to that.
You need to flush your permalinks for the new changes to take effect on your sitemap. Please head over to Settings > Permalinks and hit save to fix this.
I hope this info helps. Thank you.
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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.