The reason that you cannot find an ID is because there is no such thing as a Liveforce ID or Crew Unique ID in the app.
You will need to contact the Agency, the company that hired you for work. Liveforce doesn't provide Liveforce IDs or unique ID's. We only provide the software that Agencies use to manage it's temporary staff.
Your Agency Profile data in your app is controlled by the Agency.
Agency profile
Please, contact the Agency again. Tell them that you have been in contact with Liveforce support and that we have told you that Liveforce support do not provide Liveforce IDs or Unique IDs. The Agency control Crew profile data.
Liveforce will not be able to help you further with this.