Unlike dev managers, TPM managers are not directly involved in the projects their reports are overseeing. They are not in the same meetings, they are not solving the same problems. TPM Managers have a wide portfolio of projects they manage and it is infeasible to attend every meeting related to every project. In some companies, TPM managers also have to run their own projects, and they are different from the projects their reports are managing. Dev Managers on the other hand are responsible for projects their teams are managing. They have to provide updates, explain delays and go over the technicalities to senior management. So, they have complete tabs on how their reports are performing.
Given this structure, TPM managers can find it difficult to provide guidance and help to their reports. They have to overly rely on the stakeholders to know how the TPMs are performing. But here are things that they can do to establish a strong managerial position: