Synology DSM DDNS with Cloudflare

When you add it to Synology use the following format.

Service Provider: DNS-O-Matic
Hostname: myip (or whatever host record you are using, NOT the FQDN)
Username: Your username for DNS-O-Matic (typically an email address)
Password: Password for DNS-O Matic
Now click OK

My DNS-O-Matic record is as follows...
Email: My Cloudflare email
API Token: Is the Account ID on the cloudflare overview page.
Hostname: myip
Domain: yourdomain.com