Just how do you expect them to "acknowledge" your efforts? Most Japanese will hear a simple "good morning" or "thank you" and praise a foreigner to high heaven. I wouldn't expect an outright remark related to getting hired. (Ex. "Oh, yes, you speak so well, it is one of the main reasons we hired you.")
What sort of work are you talking about? Teachers don't even need a degree that's related to the job, you know. If it's non-teaching work, then most of the time you need relevant education, experience, and fairly high Japanese.
"Lucky enough" is a lame excuse for lack of trying. If one wants a job, one gets the proper qualifications.