See the solution in the explanation below:
Explanation:
To ensure that when users join a meeting by using a phone, they are prompted to record their name, you need to enable the meeting entry and exit notifications in the Teams admin center. Here are the steps to follow:
Sign in to the Teams admin center with your admin credentials.
Go to Meetings > Conference Bridges.
At the top of the Conference Bridges page, select Bridge settings.
Enable the Meeting entry and exit notifications toggle.
Choose Names for the Entry/exit announcement type.
Turn on the toggle for Ask callers to record their name before joining a meeting.
Click Save to apply the settings.