EPM Add-in SSO not working

Hello Friends,

Env BPC 10.1 Standard. Microsoft Office 365 EPM Add-in SP 28

Basis team configured all our users to use SSO four years back when we went live with the application.(kerbos)

Off late, we have received tickets from our users across different countries, that their sso is not working in epm add-in.

It prompts for a password. I have looked into the account, it looks active and users are able to login to SAP GUI using SSO.

EPM Add-in and Web Interface prompts for passwords. The users have not updated the windows password recently either.

This is not happening for all the users, only few of them reported this issue. Their ECC access works well with SSO.

Do you have any suggestions. Thanks for your time.