Having an issue with a domain and its DKIM and SPF records causing emails sent to yahoo.com to not be properly received.

Same emails are acceptable by other services and its headers show that the DNS settings are properly set.

Searching for DKIM or SPF gives you no results. How exactly can you fix this issue for a receiver? It happens that I also use Yahoo Mail as paid subscriber. And even after following the steps provided by https://senders.yahooinc.com/best-practices/ such email are still bouncing back.

How can you get support for this issue?

Thanks
A Sergio Cardoso
ascardoso@yahoo.com