A Microsoft file hosting and synchronization service.
Thanks for your explainations.
I had same issue for login MS office365 account with Windows10 Home.
I removed account coonection in windows as below.
disconnect work account from Windows Settings > Accounts > Access work or school > find your Microsoft 365 work account and click Disconnect,
Then, open office app(excel or word,power point..) and try log-in again.
I could recover login condition by this way.