Let's Encrypt certificate is prompted with 'unable to verify the first certificate'

:face_with_spiral_eyes:Let’s Encrypt certificate is prompted with ‘unable to verify the first certificate’.
In the browser’s view, it is already a secure link, but for some reason it still prompts’ cannot be verified '.
Can someone tell me why?
Thanks in advance.



:dizzy_face:I’m lost and would really appreciate any help!

I later found the answer at Let’s Encrypt.
Reference: Unable to verify the first certificate - Help - Let's Encrypt Community Support

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