After renew, cert fails in some os/browsers

My domain is:

I'm using CertBot (1.9.0) to auto-renew my certificates.

It seems to work fine and from my Win10 I get a valid certificate in Chrome.

However, from a MAC in Chrome is shows:

The really weird thing is the error says: ERR_CERT_DATE_INVALID, but in the screenshot you can see it doesn't expire until 22 Dec 2021, so it should be valid.

Any Idea what might be causing this? Iphone Safari seems to have issues aswell.

Scan result:

Your SSL configuration is not using the full chain and is only sending your certificate, with no intermediates. Update your webserver config to point to fullchain.pem instead. So if it was Apache then something like

SSLCertificateFile /etc/letsencrypt/live/
SSLCertificateKeyFile /etc/letsencrypt/live/

Dude, you're awesome! Thanks!

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