clear browser cache – doesn’t do anything but lose all the browsing history and important things
Delete Credentials folder – from users profile\appdata\local\microsoft\Credentials – While I didn’t try this, don’t think it would help.
Perform a Clean boot – use msconfig.exe to set next startup to be clean boot – nothing in startup items.
Open Credential Manager from Control Panel and clear out the web credentials for office – didn’t work.
Delete the Identity Key in registry here: HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity
this didn’t work either.
The Solution from a few searched sites, is to go to Settings – Accounts – Access Work or School selection – on the right side, click on each of the accounts and choose Disconnect. I believe this is the answer to this error code. Thereafter you can open Outlook, sign in again to each of the email accounts and it should work fine from there.