Color samples in brief from client

Colors in the brief are generally only suggestions, though sometimes may be very specific,  in the meantime, if you are in CMYK mode and it's telling you a color isn't available, switch to RGB. If it can be written in HEX then it can be rendered in RGB. 

You're getting the warning because it's not a "printable" color--it will render perfectly fine on the screen--simply ignore the warning--it's telling you it can't be printed in CMYK,  even when you are in RGB.

If your final  destination is never going to be for print, it's perfectly safe to ignore this. 

Here's a thread on Adobe detailing this. 

https://community.ad...ng/m-p/4071784 

Thank you!