I don't see the problem as being on your end.
Normally, if a group or game requires a specific style, it's their responsibility to communicate this before accepting someone, not the other way around.
What you can do is have a portfolio with samples of your style so the team can review them before deciding whether or not to accept you.
That said, it's also not uncommon for a team that's initially formed to eventually split up because, once the ideas to be developed are finalized, they might choose a style that wasn't entirely clear at the beginning of the process.
My personal advice is not to dwell too much on this incident and continue looking for other teams; it's normal for some jam projects to fail, but others will turn out well.