Predefined variable/parameter for usename not working?

Hello

I have Ari Stream Quiz 1.3.4 and WordPress 6.5.5. I saw this support thread someone else posted about using a predefined variable for a username: https://www.ads-software.com/support/topic/personalized-e-mail-with-username/

Now, although logging in to do a quiz is not mentioned in your plugin description or documentation, I assume that since a username variable is available, Ari Stream Quiz must support logged out and logged in users, since guest users don’t have a username.

I tried the variable as stated, which was:

{$user:name}

I tried that by doing a test quiz when I was logged in as an admin, and then sent the result to myself via email and used the username variable in the email. But instead of the username, I just got literally,

“{$user:name}”, like “{$user:name} got 2 out of 3”.

So then I tried adding another curly bracket to either end of the variable since the other variables in the plugin have two curly brackets and not one like the one above from the link. So I used this:

{{$user:name}}

That also didn’t work, but this time it just displayed a blank space where the username should be, so for example, instead of “John got 2 out of 3″, it said ” got 2 out of 3″ (with two spaces since one space is the username and one space is the space between words).

Is this variable not supported anymore? It is not listed in the “Ari Stream Quiz -> Settings -> Sharing” parameters section. The thread I mentioned is only a month ago and I see this plugin was last updated 2 months ago so thought it should be supported?