UPDATE: I ended up using a post function.
I have a custom field for single user picker called 'Tester' and I'd like to have this field update to the user who transitions the Jira issue from one status to another.
This used to work for our setup up until a few days ago:
{
"fields": {
"tester": { "id": "{{initiator.accountId}}" }
}
}
Now I get an error: "Additional fields contains invalid field(s) in 'update' or 'fields' section: tester"
I've found some other 'solutions' (including editing 'fields' to 'field') that were reported successful in the audit log of the automation but the change does not reflect on the actual issue.
I've also tried waiting after some time to re-trigger the automation (as sometimes Jira's slow to cascading changes) but still nothing.
Help me, Jira users. You're my only hope.