can’t open sitemap after changing from yoast

Hello,

Thank you for contacting Rank Math, and sorry for any inconvenience caused.

The error on your sitemap page suggests there must be some white spaces before the XML Sitemap’s source code.

Please follow this troubleshooting guide to fix that issue:
https://rankmath.com/kb/fix-sitemap-issues/#xml-text-declaration

I hope this helps.

Looking forward to helping you.

Hello,

We might need to take a closer look at the settings. Please edit the first post on this ticket and include your WordPress & FTP logins in the designated Sensitive Data section.

Please do take a complete backup of your website before sharing the information with us.

It is completely secure and only our support staff has access to that section. If you want, you can use the below plugin to generate a temporary login URL to your website and share that with us instead:

https://wordpress.org/plugins/temporary-login-without-password/

You can use the above plugin in conjunction with the WP Security Audit Log to monitor what changes our staff might make on your website (if any):

https://wordpress.org/plugins/wp-security-audit-log/

We really look forward to helping you.

Hello,

The sitemap is generated dynamically so there will be no physical file in your site’s root directory.

Please share the login details so we can fix the issue with your sitemap.

Looking forward to helping you.

Thanks.

Hello,

I was able to check that there were some empty lines in your theme’s functions.php file. I have removed them and your sitemap is working fine now.

Please check and let us know if you need any other assistance.

Thanks.

Hello,

Google automatically crawls your site. So you just need to wait for Google to crawl your URLs again and identify the changes that you have made.

Hope this clarifies your doubts. Let us know if you need any other assistance.

Thanks.