If you are using CloudFlare for hosting your DNS, there are additional steps required to ensure the integration works properly.
DNS Setup
Subdomain
If you are using a subdomain, create a CNAME record, making sure to uncheck the Proxy status box. This is all that is required.
Root Domain
If you are using a root domain for your site, you will need to enter an @ sign for name, and put the correct CNAME in the Target box. Make sure to uncheck the Proxy status box.
In addition, you will need additional TXT record added to your domain. This is found in the Domain Settings section when viewing your site. For example:
_nitropowered.mydomain.io TXT 1eb8971d5f1d43459f62f3dcd1edb2ff.ingress.nitroapp.io.
In the above case, you would add a TXT record with the name _nitropowered with the target set to:
1eb8971d5f1d43459f62f3dcd1edb2ff.ingress.nitroapp.io..