@Raeldor Thanks for reply! If your Certificate is Denied: This is due to Domain verification was not completed in 15 days causing the certificate to be in denied state.
Note that Certificate will not be billed. You have to Purchase a new certificate with same domain to resolve this. This Certificate cannot be restored.
see- https://azure.github.io/AppService/2018/02/20/Troubleshooting-Tools-for-App-Service-Certificate.html
Let us know if you have further query happy to assist.