Brave stopped recognizing my account

OK. I use Brave on multiple devices and platforms: iOS, iPadOS, Windows and Kubuntu. Today I booted into Kubuntu. Brave hasn’t synced. It also refuses to accept my login credentials. I had all my devices synced, recovery set up, etc. Now it appears, at least in Kubuntu, that I’ve lost access to everything.

Was there some kind of backend tinkering that led to this? Now I have to boot into Windows and check Brave on iOS and iPadOS. I have never had issues with the sync chain or my Brave login. I don’t understand this at all.

Somebody throw me a lifeline here, please, as Brave is my daily driver on all platforms.

When reporting here on Community, it is extremely helpful to provide as much information about your issue as you can.

What do you mean Brave hasn’t “synced”? Do you mean browsing data from other devices on your Brave Sync chain haven’t been synced? Or something else? Additionally, what login credentials are you referring to? What are you trying to log into? What happens when Brave “refuses” to accept them?