There should be a dialogue triggered there if all avatar characters refuse to claim divinity (or technically, claim to be the one to make that choice).
There is no way to continue, with any of the characters? You could try having the host test that in single player, to see if that makes a difference, or make sure a couple of the avatar characters are dead before the end of combat.
If you email email@example.com with your save (or a Dropbox or Google drive link, etc), I can see if the developer build of the game can skip to the next dialog, so you can go through that ending. If you are using any mods, also include a list of those enabled and/or the modsettings.lsx file from your profile folder.
Each save is a folder in the '..\Documents\Larian Studios\Divinity Original Sin 2\PlayerProfiles\<ProfileName>\Savegames\Story' folder.
In Windows Explorer you can zip a file or folder by right clicking on it/them and selecting 'Send To | Compressed (zipped) Folder'.