XF 2.1 Data passed via phrase isn't reflecting in template

[asprin]

I've the following written inside a template

<h3 class="contentRow-title">           
    {{ phrase('asprin_usernamechange_change_detail',{'new_username':'abc'}) }}                                   
</h3>

This the phrase



And this is how it gets displayed on the page


It loops 3 times as the table has 3 records. So that's fine. But why isn't the data being passed onto the phrase text? It must be something trivial that I'm not seeing at present

 

[Bob]

remove the $ eg... {new_username}

 

[asprin]

remove the $ eg... {new_username}

I can't believe I was this dumb

I referred to core phrases and picked up the syntax from there but didn't realize how insanely silly it was to not notice the $sign