How to fix no valid rel=canonical tag?

hello.

I am using the default Canonical tag provided by Rankmath.

And my permalink is written in Korean ><link rel="canonical" href="/%eb%b2%a0%ed%8a%b8%eb%82%a8-%ed%99%98% It is displayed as ec%9c%a8-%ea%b3%84%ec%82%b0/">.

When I test my website on https://pagespeed.web.dev/, I get an SEO issue that says no valid canonical tags are found.

https://pagespeed.web.dev/analysis/https-vietnamguide-co-kr-%EB%B2%A0%ED%8A%B8%EB%82%A8-%ED%99%98%EC%9C%A8-%EA%B3%84%EC%82%B0/oirjkfowek?hl=ko&form_factor=desktop
Can you tell me how to solve this problem? thank you