Outlook – this dialog box for

This worked for me. Basically delete all the wrong credentials in your vault and save the correct ones in. Here's how:

1. Click Start, click Control Panel, and then click Credential Manager.

2. Locate the set of credentials that has Outlook in the name.

3. Click the name to expand the set of credentials, and then click Remove from Vault.

4. Repeat step 3 for any additional sets of credentials that have the word Outlook in the name.

Then it should ask you for your credentials again. But this time make sure you have them right and click "remember me".

A collection of various known Outlook fixes for login problems :

• Run Credential Manager, and if your account is listed ensure that it's correct.
  • If not correct, fix it.
  • If correct, try deleting it, reboot and log into Outlook.
• Logging-in into Web Outlook might sometimes show an existing problem such as the need to change the password.
• Start Outlook in safe mode by running Outlook.exe /safe and enter the ids if asked.
• Unlink the Microsoft Account from Outlook
• Disable Modern Authentication by regedit to HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity, create a DWORD item named EnableADAL and set it to zero.
• Under the same registry key, create a DWORD item named DisableADALatopWAMOverride and set it to 1. See Microsoft article.

Undo fixes which didn't help. You might also create a system restore point before starting.