Hello,
Thank you for contacting us and sorry for any inconvenience that might have been caused due to that.
Please note that by default, sitemaps are set to Noindex as they are meant to be crawled and not to be displayed on search results pages.
You should submit your sitemap to the sitemap section of your GSC account:
https://rankmath.com/kb/submit-sitemap-to-google/
If Google can fetch the sitemap properly, you don’t have to worry.
Regarding the robots.txt file, it is getting redirected from WWW to the non-WWW version by WordPress. In this case, you can ignore this error:

Hope that helps and please don’t hesitate to let us know if you have any other questions.
Hello,
You can safely ignore the redirect error for your robots.txt since it is redirecting properly (from WWW to non-WWW).
You should focus on the URLs with content under the Indexing section that may have prevented your site from being indexed:
https://support.google.com/webmasters/answer/7440203?hl=en
To better understand the status reported, you may refer to our guide here:
https://rankmath.com/kb/url-inspection-api-integration/#not-indexed
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.