Widget: Has anyone got pre-population working?

Hi folks,

We're trying to get name / email to pre-populate in the widget but haven't got it to work thus far.

Here is a minimal repro of what we're doing: https://gist.github.com/mikesimons/498c2c003a8b25abeeba5c7bc32bc8f7

The code is taken from the Installation tab of the dashboard and setting the contact data from here: https://developers.trengo.com/docs/set-ticket-data

Given how minimal the repro is I suspect an issue either with docs, the widget or our account.

Any working examples or pointers would be greatly appreciated.