Hi there,
First of all, thanks for your trust.
Can you please uninstall the Add-on and re-install it? Imight be a temporary Google issue.
If that doesn't work, it might be due to having multiple Google accounts connected in the same time under the same Chrome browser. Google can't handle when multiple accounts are logged in.
SOLUTION: I recommend creating a new profile in Google Chrome with the account you are using Labelmaker with. This will make sure it'll always work with the right account. It takes only 1 minute to setup.
Let me know it helps,
Lucy