I'm developing an action on Google that requires the user to login with my services. I was able to implement account linking.
That works fine; I'm able to complete the entire flow to authenticate the user using the Google Home app, but I couldn't find a way to unlink the account. The service does not appear at
Apps with access to your account
Is there any way to unlink an account?
The "preview" feature on both API.AI and Actions SDK will clear any existing OAuth tokens for your action on your account.
After running "preview" and invoking your action -- "OK Google, talk to $invocationName" -- you'll be prompted to link accounts again.
Apparently things have changed since this was answered. Now there is a 'user' icon in the Simulator which you can use to unlink.
Go Action on Google console -> Simulator, then click 'Testing on Device' botton, Finally restart the test.
You can unlink your Google account from: https://myaccount.google.com/u/0/security?hl=en
来源：https://stackoverflow.com/questions/41079546/account-unlinking-on-actions-on-google