Agency by estoppel means:

conduct on the part of the agent that implies an agency relationship must be stopped as soon as the principal implies disagreement.

the agent creates an appearance of authority in the principal which leads a third party to reasonably conclude that the agent has the authority to perform certain acts.

conduct by the agent through word or actions is not sufficient to bind the principal to contracts the agent creates.

actions by the principal lead a person to believe that the presumed agent has authority to act on the principal's behalf.