HA Supervisor setup error on Synology - save error on "share data" screen

Installed regular HA on my Synology DS718+(DSM 7.1.1), with Docker, using instructions from mariushosting, no issues. After playing around I decided to move to HA Supervisor, again followed instructions to completely wipe the old container, images, network, etc. Fresh install of HA Supervisor gets me to the screen to select what data to share, and clicking “next” returns a “Failed to Save: Unknown Error” popup. Best guess is there’s some lingering footprint somewhere preventing the save action, but it had no issues with me creating the account and selecting my location. Any tips on how to investigate?