Outlook prompts with a basic login box when an application tries to send an email via MAPI with the applications exe name (Enter1) in the login title information

 1. Remove all stored credentials under "Manage Credential Manager" > "Windows Credentials" relating to Outlook

2. Delete all Outlook Profiles

3. Delete

   - HKLM\Software\Microsoft\Office (Need to take ownership of some of the folders)
   - HKCU\Software\Microsoft\Office
   - HKCU\Software\Microsoft\Exchange

4. Run a repair of office

5. Reboot device

6. Set up Outlook and make sure modern auth pops

7. Set cache to 6 months

8. Leave it for a few mins

9. Reboot

10. Open Outlook

11. Test
*Outlook needs to be open when sending.