Install the Creative Cloud Desktop app.
macOS NTLM authentication issue | CC 2019
If your network requires NTLM authentication and you are using a macOS computer, the following dialog box is displayed when you launch an Adobe app. You will be unable to use the app.
Log in to the Creative Cloud Desktop app.
Click the gear icon in the upper-right corner and then click Check for App Updates.
Relaunch the app.