Hi Sami,
Thank you for posting, I am here to help. May i know if you are disabling this via Active Directory?
Have you reported this to your IT administrator?
We recommend you to report this to your IT administrator can help you to disable the account of this current user.
Let me know how this goes. Looking forward to helping you out. If you need more help please feel free to let me know.
Best regards,
Jansher