Multiple people independently managing the same project can create conflicting instructions, missed tasks and unclear accountability. Appoint one lead project manager, define their authority, and delegate work clearly so the team knows who is coordinating delivery and resolving competing priorities.
Keep good control of client communication. Ensure all important communications are between the project manager and the client project manager, especially for cost, schedule and scope decisions.
You don’t want to wait weeks and months for a client to approve your proposal. Save time and win more business by understanding the approval delegation limits of your client.