Unable to verify the first certificate and lets encrypt cert


"Unable to verify the first certificate" message for a request on one domain.

If i uncheck “Enable SSL certificate verification”, i have no longer the message.
I check with success, the SSL certificate with web browser.
But i want to understand the problem.

On an other server, config identical, i don’t have this message.

Certificates got with Let’s encrypt.
The only difference is the CA issuer (R3 or R10).

How can i debug please ?

Thanks in advance.

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