@number73 you just have to include the instance to resolve the user. same as with email addresses
@morganastra So just to be clear, my UNIQUE id is @number73 right? The varying domain after the 2nd '@' being the instance
@number73 @morganastra if you want to tag someone outside of your instance you can do it like this:
@person@instance
@s02303947 @morganastra Sweet :) thanks
@morganastra Ah ha! That makes sense. Thank you :)