Final answer:
The ethical issue involves a potential conflict of interest due to lack of transparency. A private meeting and written documentation are two communication strategies to address concerns with the Agency Principal.
Step-by-step explanation:
The ethical issue in this scenario involves a potential lack of transparency and conflict of interest. As per relevant real estate laws and ethical guidelines, there must be full disclosure when an agent or principal of the agency is involved directly in a transaction to ensure all parties are aware and can provide informed consent. Without this transparency, the vendor's trust could be compromised, potentially violating professional conduct rules.
To address this with your Agency Principal, communication strategies would include scheduling a private meeting to discuss the concerns openly and professionally as well as documenting the conversation in writing, which provides a record of the concerns raised and any responses or decisions made.