Gmail refuses to accept DKIM record

Hello

weirdly, Gmail refuses to accept DKIM record. I sent a new test and DKIM check failed :

Message ID [email protected]
Created on: 15 January 2020 at 09:38 (Delivered after 0 seconds)
From: XXXXXX Devis Personnalisé [email protected] Using PHPMailer 5.2.27 (https://github.com/PHPMailer/PHPMailer)
To: @gmail.com
Subject: Confirmation de commande XXXXXX
SPF: PASS with IP 68.66.240.217 Learn more
DKIM: ‘FAIL’ with domain XXXXXX.fr

DKIM is added to cloudflare dns and here is the test : https://www.mail-tester.com/test-bfh6q

Mail-tester doesn’t like your DKIM key. It looks like there’s a line-break in it.