Certificate not valid - email questions

I’ve just set up Cloudflare free version with my website.

For the email setup on my android it is saying Certificate not valid and I can’t get past this message. But it looks like my website is active and set up ok, SSL says Full security level Medium?

Also how long before GTMetrix will pick up the CDN, as the score is still 53% quite low.

Any advise please?


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