Hello,
I received an expiration email for my ssl certificate the date 05/28/2021 but I see that there is a delay in the expiration date of my certificate and valid until 02 / 08/2021 can you help me
best regards,
Welcome to the Let's Encrypt Community, Youssef 
Looking at the certificate history for rocketmeup.com, we can see what's happening here.
I'm assuming this is referring to this certificate expiring 2021-05-31 that covers:
X509v3 Subject Alternative Name:
DNS:rocketmeup.com
DNS:www.rocketmeup.com
I believe this is referring to this certificate expiring 2021-08-02 that covers:
X509v3 Subject Alternative Name:
DNS:rocketmeup.com
As you can see, the newer certificate does not cover www.rocketmeup.com and thus is not considered a renewal of the older certificate. This is why you received an expiration email for the older certificate.
You can find a detailed explanation here:
thank you for your support
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