Automation for JIRA : " No matching transitions could be found for issues "

[OA]

I created some rules using "Automation for JIRA" , lite version, at Cloud JIRA Helpdesk.

This is one of them:

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When: Scheduled JQL search

Searches with:
project = MY_PROJECT AND status in ("Status_example_1", "Status_example_2") AND (labels in (EXAMPLE_LABEL))
every 7 Days

Log action
Then: Add value to the audit Log

{{now}} - {{issue.fields}}

And: Transition the issue to: FINAL_STATUS

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Both cases Status_example_1 and Status_example_2 have transitions going  at the same FINAL_STATUS

If I press "run rule", it effectively finds the Issues I want to work with (as I can see at the log).

But at the end, nothing happens and the log goes:

     No matching transitions could be found for issues  (and then the list of found issues)

The Add-on actor has the permissions needed (there is a condition at the post function: just some roles allowed to make those transitions, and the actor has the role)

I am missing anything?

Thank you very much indeed.

[OA · Accepted solution]

I answer myself:

It is mandatory to specify the reg.exp. for the transition (???!!!)

In my case it worked (for both transitions implied in my workflow, "Accept" and "Approve" ):

(.*ccept.*)|(.*pprove.*)