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Hello @raihansardar,
Thank you for contacting us and sorry for any inconvenience that might have been caused due to that.
Please head over to your WordPress Dashboard > Rank Math > Titles & Meta > Tags, and from there make sure the Tag Archives Robots Meta are set to index. Here’s a screenshot for reference: https://i.rankmath.com/i/d5hdNK
Once done, please try to clear your sitemap cache by following this video screencast and see if that works for you: https://i.rankmath.com/pipRDp
Let us know how it goes. Looking forward to helping you.