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do
```
var recordId = rec.id;
```
and you are missing variable declarations for recordType and isDynamic

Curious - If i'm able to get the record id, does it matter which way it's done?

Because the `rec.getValue('id');` gets the Id fine

If it gets it fine then there it is not an issue.  I just know that the "official" way to get it is through the rec.id property