To receive assistance from Dell support, they need to check the warranty status. Click the "Get help now" icon on the right to start a live chat session. Provide to them the private monitor Service Tag, 20 digit serial number, and all of your troubleshooting Yes/No, do you see color issues on the full colored screens when running the S2722DGM stand alone Built-in diagnostics? See the online S2722DGM User's Guide page 53.
In some applications, the green and blue are more saturated/accentuated than normal. When trying to take a screenshot of the issue, in paint it is looking fine but in the application itself it is looking wrong. I saw this issue for now on Chrome and Discord but in games it does not appear. I have all latest drives and Microsoft updates. I had this issue when I bought it but after some 1-2 days it disappeared but now after cleaning the pc it came back for more than two weeks. Any idea what is causing it? I am connected to the DP port and did not test with an HDMI at the moment because I do not have one on hand. Firmware is M3T101. Tried LCD conditioning but no luck.    
S2722DGM, color issue in some application