.email() recipient built using variable substitution not working

Hello,

I'm building my email recipient by getting a specific tag value and concatenating it in a string but it is not sending an alert.

var email_target = '{{ index .Tags "Product" }}@example.com'

var email_target = '{{ index .Tags "Product" }}' + '@example.com'

Both are not working, but if initialize the variable directly I was able to receive the alert.

var email_target = 'my-product@example.com'

Here is what the alert node looks like:

data
|alert()
.warn(lambda: "state_duration" >= warn_duration AND "value" != running_threshold)
.stateChangesOnly()
.message(message)
.id(idVar)
.idTag(idTag)
.levelTag(levelTag)
.messageField(messageField)
.durationField(durationField)
.details(details)
.email()
.to(email_target)

Is this not supported yet? I'm not seeing any errors as well when this TICK script is deployed.

Start with the alert node shown in the issue, especially .email().to(email_target), and reproduce both tag-substitution and string-concatenation forms against the literal recipient. Check how dynamic recipient values are evaluated and whether deployment reports an error; done means the behavior is defined, verified, and the missing-error behavior is addressed.

Written by the indexing model from the issue text.