How to fix

Email Routing doesn’t work with partial zones. Make sure you configure this zone with Cloudflare as your primary DNS provider.
How to fix it

Email Routing only works when you’re using Cloudflare name servers.

https://developers.cloudflare.com/email-routing/

How to know name server in this case to update dns to cloudfare primarily

When you set up a domain directly at Cloudflare, it will assign you name servers.

https://support.cloudflare.com/hc/en-us/articles/360037345072-Getting-Started-with-Cloudflare-Video-Tutorials

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