Importing Sites from Sharepoint is erroring invalid credentials when activating Office 365 securlets

Products

• CASB Securlet SAAS
• CASB Audit
• CASB Gateway
• CASB Gateway Advanced
• CASB Security Advanced
• CASB Security Premium
• CASB Security Premium IAAS
• CASB Security Standard
• CASB Securlet IAAS
• CASB Securlet SAAS With DLP-CDS
• CASB Security Advanced IAAS
• CASB Advanced Threat Protection

Issue/Introduction

Attempting to import the sites fails with the red error invalid credentials and a reference number.

Resolution

The following is required for successful validation of the credentials:

1. Validate and make sure the user id and password are correct.
2. The OneDrive password must be typed in the box and not pasted because pasted content is just entering the asterisk characters not the actual text password i.e. **********.
3. Sometimes we get this error if the password contains special characters, in this situation, change your password removing special characters.
4. Sometimes we get this error if administrator is using SSO for Office 365\Sites login during the activation flow. CASB\CloudSOC don't support SSO in the activation flow. 
5. Site import feature does not work with MFA. Ensure that the user configured for the site import does not require MFA.
6. If none of the above works export the site list from sites and import the sites, as there is no need of providing user id/password. For steps see: Article 175925 - Manual import of sites during MS Office 365 Securlet activation
7. Please ensure you have followed the Article ID: 175597 - Prerequisites for activating the Office 365 Securlet
8. If none of the above resolve your issue please refer to  Article ID: 171265 - Error "Invalid username or password" when activating Office 365 securlets

NOTE: There is no difference between methods to active sites while Office 365\Sites - both login and CSV will active updated list of sites in organization. 

Additional Information

Symantec CloudSOC - Enabling the Office 365 Securlet

Article ID: 171229 - Office 365 Securlet User impersonation error