Registry fix:
HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\AutoDiscover

ExcludeLastKnownGoodUrl
ExcludeHttpsAutoDiscoverDomain
ExcludeHttpsRootDomain
ExcludeExplicitO365Endpoint

1. Start Registry Editor.
In Windows 10 and Windows 8, press the Windows Key + R to open a Run dialog box. Type regedit.exe and then press OK.
2. Locate and then select the following registry subkey: HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\AutoDiscover
3. Add a new DWORD and name it (see below)
4. Right-click the new file. Then change Value from 0 to 1.
5. close everything and recreate a new profile for outlook