Answer: Immediately
Explanation: An Agent is a legally appointed third-party to act in the place of a person or organizations.
Whenever an agent changes employment from one dealer broker to another he has to immediately transfer his registration number, the registration number of an agent is very important as it is one of the main requirements for Government regulation of an agent.
The registration number of an agent gives the agent some level of credibility and ensures that the agent has gone through the legal and valid requirement for practice.