I have a client that wants 360 Google Street View images of the inside of thier location. Will a pano image from an Osmo (out of DJI Media Maker or otherwise) work?

We have 360° Pano mode for Osmo, do you mean the 360 Sphere? If yes, you can have a try with the third party program to compose.

I was trying to use pano mode on the Osmo. We did a test and the pano image loaded as a regular photo although long and skinny. I'm guessing it may be easier to get a separate camera that shoots something more native to Google.