@Nicole544
I tried to look at your profile and listings, but your account is not visible.
Did Airbnb suspend your account or do you own another account ?:
https://www.airbnb.com/users/show/19677902
Do you really have no idea about the reason for investigation ?
Think about:
- problems with a recent booking / guest
- complaining neighbours
- violations of local laws (like restrictions) or rules (like not mentioned security camera's )
- Payments not via website
- cleaning , technical or safety issues with the accommodation
etc...
added: i just see you got a respons from a community admin, hope your problem will be solved soon !