Keyphrase in Introduction

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Hello I have a question, can it be that Yoast cannot analyze the keyphrase correctly?
My keyphrase is in the title, and in the 2 paragraphs at the beginning of the page.
In the first paragraph my first word is the keyphrase and later in the same paragraph it appears again. It occurs only once in the second paragraph.
But still Yoast SEO says i don’t have a keyphrase in my introduction, what should I do?
And does it make a difference if I write the keyphrase like this or like this:
keyphrase — Keyphrase
Does uppercase make a difference?
Thanks for writing back.