If you followed the second guide, it creates new certificate files and use the same name than the old ones, that's why you do not need to modify the Apache's configuration.
We have a Support Tool that will gather relevant information for us to debug the issue. Could you please download and execute it on the machine where the stack is running by following the steps described in the guide below? You must click on the platform or cloud that you are using to find the correct instructions.
How to Run the Bitnami Support Tool
Please note that you need to paste the code outputted by the tool in your reply.
Apart from that information, could you please share with us the output of the following commands?
sudo ls -la /etc/lego/certificates/
sudo ls -la /opt/bitnami/apache2/conf/