Why does Zoho Assist for OTP when other browser tabs are all logged on respective Zoho products?

Why does Zoho Assist for OTP when other browser tabs are all logged on respective Zoho products?

      I have individual browser tabs respectively logged onto Zoho Mail, Writer, Sheets etc. Despite this when I try to logon to Zoho Assist in a new tab it still wants a OTP verification. Looks like Session authentication issue?