Yes it seems to be the Lets Encrypt variable but as I said above, the install script will not permit an opportunity to provide an email address. As soon as the SMTP password is received, it seems to jump past that stage, and pops an error.
You can see that here…
Hostname for your Discourse? [forum.uaptn.com]:
Email address for admin account(s)? [forumadmin@uaptn.com]: xxxxxxxxe@protonmail.com
SMTP server address? [in-v3.mailjet.com]:
SMTP port? [587]:
SMTP user name? [b91xxxxxxxxxxxxxxxxxxde52d]:
SMTP password? [1d2xxxxxxxxxxxxxxxxxxxxxxxxxxxx903]:
./discourse-setup: line 438: [: too many arguments
Checking your domain name . . .
Connection to forum.uaptn.com succeeded.
Does this look right?
Hostname : forum.uaptn.com
Email : xxxxxxxxx@protonmail.com
SMTP address : in-v3.mailjet.com
SMTP port : 587
SMTP username : b91xxxxxxxxxxxxxxxxxxxxxe52d
SMTP password : 1d2cxxxxxxxxxxxxxxxxxxx5086903
Let's Encrypt : PASSWORD (SECRET KEY)
ENTER to continue, 'n' to try again, Ctrl+C to exit: