My site is not running over SSL, each time i set SSL, it shows server error 521, when off site work

My site is not running over SSL, each time i set SSL, it shows server error 521, when off site work.

I did whitelisted all IP’s from this list: https://www.cloudflare.com/en-gb/ips/

to default-allow-http and default-allow-https in Google Cloud>VPC Network>Firewalls

Please advice. My website is: https://www.gears4fitness.com/ it works fine without ssl: http://www.gears4fitness.com/

Thank you.

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