What to do if i have read online how baking soda would eliminate armpit odor?

Heads up: You're free to try it. You'd be even smarter if you didn't. If you have body odor, you'll lose your job and they won't tell you the real reason. Out of consideration for yourself and your neighbors, use a mainstream deodorant. This is the 21st century.

Improve diet: Try 'detoxing' by improving diet, and exercise. While I doubt baking soda will hurt you, I question it's effectiveness. Try it on a weekend to see without putting off anyone in public. Also, consider trying another deodorant, particularly one without aluminum in it, as aluminum has been associated with Alzheimer's.