Office 365: Unable to Authenticate Your Credentials
Office 365sUnable to Authenticate Your Credentialsis not a frequent error code but its definitely a very annoying one. Contents How to Fix Office 365 Credential Authentication Errors 1. Enable TLS 1.2 If youre using MSolService, check that TLS 1.2 is enabled. Check your user name format double-check youre not using an incorrect format for your user name. The correct format to use is the following:<user_name >@. see to it there are no typos either....