Fix Sitemap Indexing Issue

My e-commerce website's sitemap is not being indexed on Google Search Console, and I need help to resolve this issue.

Ideal Skills and Experience:
- Expertise in Google Search Console
- Experience with e-commerce websites
- Knowledge of sitemap protocols
- Familiarity with WordPress, Shopify, or Magento (specify your platform)
- Strong problem-solving skills

Please provide a brief overview of your approach and relevant experience.