This could be due to various reasons. Please see below regarding general information and timelines.
1. If you just recently applied your custom domain settings, it can take time for our system to apply the SSL. General timelines are 7-10 business days (weekends excluded), however, this can take longer at times.
2. If you applied any settings incorrectly, we are not able to apply and/or renew your SSL in such cases. Please ensure your settings are set properly.
3. If you previously had a secure domain and it is no longer secure, please note that SSL certificates expire. Unfortunately, this is not within our control and the SSL needs to be renewed every 30-60 days. During the renewal periods, please double-check to ensure your settings are still correct per our video below. If so, we generally need 7-10 business days (weekends excluded) to renew the SSL for your domain. We try our best to renew prior to the expiration period, however, due to volume and limits, this is not always possible.
Please make sure you are following the steps closely as shown in this video to ensure you have entered the correct settings.