Yes exactly you are right! it's just like you said! but THEN I was able to issue my ssl cert via
bitnami wordpress script for this purpose- I found instructions here (look at bitnami auto-config script section):
The first time I tried with the second option provided..but probably I forgot LEGO - and even if deleted account folder I got unexpected error! -> but you can slighty consider this post as "nearly" closed cause I do actually already have (now ) a working ssl cert on my website!
(that was possible causa the AMI I used already had that script ready to be ran!)
thanks anywas alejandro
have a nice afternoon