From the situation to a useful next step.
Here is a possible starting point. In a conversation, we can clarify the circumstances and agree my involvement.
The next step falls between responsibilities.
Where we could start
Clarify where the work has stopped and which decision, resource or handover is needed next. Separate known constraints from assumptions with the participants and prepare the next agreement.
What you would have
A description of the obstacle, open questions and the next decision, including the people needed to make it.
Who needs to be involved
The requester, representatives of dependent work and a leader authorised to make the required decision.
Roles and decisions
The proposed approach needs checking against your situation. I do not replace management authority or specialist professional assessments.
Prepare an enquiry
This is an editable starting outline, not a submitted enquiry. Add your own circumstances.