No need to add unicode to solve the problem. Go to Xcode -> Target -> the display name of the application and add the desired name -> "My application", and the most important thing that solved my problem:
- Go to your Apple Developer Account: https://developer.apple.com/account/#/overview/
- Go to Certificates, Identifiers & Profiles
- Go to: Identifiers → Application Identifiers
- Select the package identifier used in the application for which you want to change the name.
- Scroll down and click the Change button.
- .Change the name in this section, see attachment:

- Scroll down and click Finish .
Until I completed these steps, the application name worked fine while I ran the build from Xcode.
When I added the new assembly to TestFlight and downloaded the application from there, the namespace disappeared, so I had to follow the steps above to fix the problem.
Adela source share