Not exactly,
Actually, as I think more about it, I'm certain it's the other way around. It was a regular cell phone number. I also had a Google voice number. I had to move my Google voice number to a different Google account. Then I ported my old cell phone number into Google fi on my primary Google account. Subsequently I set it up so that both worked with obihai. So it was only after porting it in that it did work. I'm certain it was that way for many months although I typically use the obihai with the second Google voice number (IP landline) rather than the Google fi number (which I used mostly as a cell phone number except when my cell phone was inop).
So I'm revising my statement above. I'm 100% certain it was working and that it is now not working. Does that change your response in any way?
So in summary it has stopped working on Google fi but continues to work on Google voice. I did not make any changes for this to occur. It's possible that's Google fi changed or else for some reason the current credentialing is not working with Fi. I apologize for the inaccuracy in my statement in the original post.
Thanks,