SSL 521 error: Cloudflare a-record pointing to DigitalOcean droplet

I have read many posts about this issue but I am still having issue.

Client is using Cloudflare, Full SSL for their website. I have a ubuntu digitalocean droplet with a web-app that needs SSL. I have created the a-record WEBAPP in Cloudflare pointing to the IP of my digitalocean droplet. So, should answer at digitalocean with HTTPS. Note: http works fine.

I have confirmed firewall is accepted https and 443 is open.

I read documentation about adding a cert to the droplet but Let Encrypt says I need nameservers pointing to DigitalOcean. **Is this a requirement? I would prefer to not have to move the nameservers since the only thing on digitalocean is this one app.

What I am missing here? Thanks!

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Did you try to diagnose the problem with ? Can you give us a test result from there, please ?

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