Desktop icons like message, call, etc are unresponsive to touches. They are only for showpiece. Nothing opens up after touching these icons...
If you are on MIUI this is unfortunately caused by the OS, there is a security restriction preventing Kustom to open links, i have already asked several times to Xiaomi to look into this and i am currently working on a MIUI device to check if there is any workaround
This has been partially fixed in KLWP 3.29, the fix is a workaround but should work properly