Hey everyone,
Following the steps here should solve the issue (particularly deleting your save data):
Deleting your save data will NOT make you lose your account or progress.
- Your game progress is saved on our game servers, not on your Switch and deleting things off your Switch cannot erase data from our game servers.
- You will also not lose your account as it’s linked to your Nintendo Online account, so the next time you open the game it will automatically open your Gems of War account for you
If you try all of the steps in the linked article and continue having the issue please let me know.