Cloudflare ssl certificating marked as not valid?

hello,
I have active Cloudflare cloud DNS and synced all DNS records to Cloudflare, then I tried to generate an SSL Certificating and save it in Virtualmin, so I did and I enabled SSL for the website, but whenever I try to visit it I see this, it seems like it’s not valid.

edit:
i tried SSL/TLS encryption mode on:
Flexible
Full
Full(strict)

and turned off/on SSL/TLS Recommender, but still marked as not valid

SYSTEM INFORMATION
OS type and version ubuntu 20.04
Virtualmin version 7.2-1 Pro

It can take up to 24 hours for the free service from Cloudflare.

ill be very thankful if someone has a guild on how to install Virtualmin with Cloudflare, and setup SSL from cloudflare

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