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Please note

If Multi Factor Authentication is enabled for additional security for the Office 365 tenant, authentication will fail in Locator, as MFA is not currently supported. If MFA is enabled, you need to have your Office 365 tenant administrator whitelist the public IP used by the server Locator is running on.

If you are unable to log on after you have followed the above steps and see this in your w3wp.exe.log file:

2018-10-24 07:16:19,326 INFO  [83:(<null>)] Via.AzureAD.Security.Plugin.AzureAdCredentialsVerifier - User NOT authenticated, username or password is incorrect: firstname.surname@example.com

It is very likely that Multi Factor Authentication is enabled, and a whitelist entry has to be made.