There is a common misconception that "between" only expresses a relationship for two elements (e.g. things or people) while "among" is used for more than two elements.
"Between" is used when the elements are distinctly or specifically made known to the reader.
Example: There is a final match between Brazil and Argentina.
On the contrary, "among" is used when the elements are not specifically named.
Example: The leaders will be discussing the issue among themselves during the meeting.
Since your phrase "team members" refer to workers in general who are roped in for the same assignment, "among" will be the appropriate choice.
I hope this helps.