Why have all the one-time passwords in my 1Password become invalid?

Hi there @jinxue

One-time passwords rely on your system clock being accurate to within a few seconds, so if all of them are invalid, that'd suggest that your clock is incorrect by more than 30 seconds or so.

☞ Check https://time.is/ to see how your system clock compares to internet time and adjust it as necessary.

Give that a try and let me know how you get on. I'll be here if you need further help. :)

— Grey