A team is a group of people working together towards the same goal. The first time Tech Lead might mistakenly see their role leading on all the technical aspects and forget about how the team works together. Although this responsibility may be shared with other roles such as the Team Lead or Project Manager, a Tech Lead must also shepherd the team to move in the same technical direction.
It is all too easy for the first time Tech Lead to ignore heated discussions between two developers, or to ignore how technical team members interact poorly with or disrespect non-technical team members.
The more experienced Tech Lead realizes that the lead part of their role is just as important as the tech, and constantly looks for ways to build trust and relationships between people in the team. They use practices like white-boarding architectural diagrams as a team, establishing coding or architectural principles with the team to guide individual decisions or running regular improvement katas or retrospectives.
Source: Three Common Mistakes of the First Time Tech Lead, Patrick Kua, https://www.thoughtworks.com/insights/blog/three-common-mistakes-first-time-tech-lead