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Fixing Yoast Sitemap XML Declaration Error

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Problem Description: Error occurs when XML sitemap contains space at top of PHP file
Problem isn't specific to Yoast SEO plugin
Error can be caused by other plugins or themes
Solution Steps: Move site to development server to isolate issue
Disable all plugins except Yoast SEO
Switch to Twenty Twenty theme
Activate plugins one by one to identify problematic ones
Check functions.php for blank lines before <?php declaration
Comment out theme files included/required in functions.php
Apply fix to live website
Check for Must-Use or Drop-in plugins if needed