Okay, so Youtube changed how profile links are displayed awhile back.
Basically what I need is when you type @darnell@youtube.com it should redirect to https://www.youtube.com/@darnell (instead it redirects to the old Youtube profile links).
This normally would not be an issue except that YouTube allowed me to obtain the @darnell handle & if I “mention” my Youtube handle it redirects to…nothing on Write As! 
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Is there a way you could fix/update it so it redirects to the new YouTube handle (as that is what Google will be going with so far.
To see a “live” example, here is me testing this out (on my test site): This is a Youtube mention test. Please ignore — WriteFreely Testing Site
Thanks for reading!