@JimMcGradyNo, its not possible. You need to upgrade Panorama to 9.1.x then only you can manage gateway running on 9.1.x through it.
For managing gateway through Panorama, Panorama firmware should be >= gateway firmware version.
Hope it helps!
Click Accept as Solution to acknowledge that the answer to your question has been provided.
The button appears next to the replies on topics you’ve started. The member who gave the solution and all future visitors to this topic will appreciate it!
These simple actions take just seconds of your time, but go a long way in showing appreciation for community members and the LIVEcommunity as a whole!
The LIVEcommunity thanks you for your participation!