Tag page not working - Error 404

I placed an article tag field below the zero app articles, so that the user can click and be directed to a page with articles with the same tag, but it's giving a 404 error, could you tell me what I'm doing wrong?

Scroll down the page, the tags will be below the text:
https://www.icesjc.com.br/index.php/mensagens/a-igreja-na-cidade

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