Clients are complaining about the delay on a product delivery timeline.

When clients are complaining about a delay in product delivery, it’s important for the project manager to engage the stakeholders effectively12. This can be done by working with the team and the product owner to define the next steps12. This approach ensures that everyone involved in the project is aware of the issue and can contribute to the solution. It also helps to maintain transparency and trust with the stakeholders34. The project manager should also communicate the issue and the proposed steps to the stakeholders promptly, ensuring transparency3. References: 

https://www.onethreadapp.com/blog/project-delays/