Yeah, that will happen if 1) you erred in entering your Wiki ID ... 2) might well be something else as might 3)
In general YOUR Suggestion page is geared to YOU. Were you in someone else's Suggestions? I tested that with a randomly selected profile (unique spelling) from some totally unrelated Surname and it accepted MY Wiki ID without a problem.
So, I suppose there may be other reasons, but no, if your ID was correct, it should have accepted your Suggestion remedy