Switch(SelectedValue Help

Hello - I am trying to write a what I think is a simple dax statement however I always end up with an error. I looked at a blog which provides the same type of logic however I cannot get mine to work. Please Help, what am I doing wrong?

SWITCH(SELECTEDVALUE(SAMPLE_TABLE[PROJECT_HEALTH],"Red","Red","Green","Green",BLANK(),"Complete", ""))

Thanks for any help!