What are some ways that an employee's ambition can work against them?

Could be viewed by colleagues as too aggressive or untrustworthy.

Disregard for team work and undermining their own team for personal gain.

It can be counter to a company's culture.

Self-serving ambition without regard for how it will effect others. Taking opportunities from others or taking undue credit.

Excitement and ambition could become deterrents if the recipients of information decide they're harmful. Incorrectly labeling communication issues might lead to similar perceptions. "When you did that, it made me feel like this. Is that what you meant?"

Petty, threatened or unqualified leadership.

Stepping on other people’s toes or having an ego.

They do jobs they weren’t asked to and it can step on someone’s toes or cost them money

Annoy the Manager or work too fast and break something.

Not settling into the current job. If you are always looking at how to move up the ladder without committing fully to what you are currently doing, then you can't succeed.

Working with less talented people who see you as a threat.