I had this exact same issue. My thought was that it happened because I had to close the game before the second fight and couldn't get back to it for a couple hours. Does the tutorial monster despawn or wander off if you don't fight it soon enough?
I used the DELETE-ME code to start the tutorial over again and this time fought both monsters right away.
@tiz Amulets are very rare drops from monsters, but they can be found in Chests up to a certain tier, 6 is the limit I think. You can also get them from Drakonian Orbs, especially when they have the guaranteed legendary, but they will be limited to your level tier (9 currently).
@avencast I would disagree, upgrades provide significant power boosts are lower levels where the stat values are quite low. Because you natually gather Sila as you level up, I think its worth spending it on your excellent+ quality equipment that you are using now, even if it gets tossed away later. However, I would not suggest that you upgrade your gear beyond level 4-5 as that is when the cost becomes higher, even for lower level gear.
@shepardini i just tried to swap out an item that is being upgraded and get a message saying cant change item while item is being upgraded.
Best option is to send a Dm on the Maguss FB page (hoping there still have peeps looking at them) explain the issue and they will need your player name and player ID (that can be found on the settings page in game).
I have an alternate suggestion.
The problem seems to be that the people who want to duel are not always online and playing together at the same time.
So what if you just limit dueling to the first 15 or 20 minutes of each hour?
Then that would make people who are wanting to duel 3 or 4 times more likely to be online while other duelists are.
Maybe you could just implement this for a short period of time until the number of active players increase. Or until the game comes out of beta. Or maybe just during the later half of the dueling season when participation slacks off.