link accounts button missing

user_5ce9a0, Thank you for reaching out to Comcast Business Support. Let me know if this is helpful, if not, we can take a look at some other options. 

To link several Business accounts to one main profile on Xfinity, follow these steps:
Accept an invitation from the Primary user of the account.
Receive the invitation via email, text message, or both.
If the personal email or mobile number matches the Xfinity ID, choose to link accounts or create a new profile.
If the personal email or mobile number differs, sign in with your password to link accounts.
Confirm account details like street address, mobile number, or email.
Click "Use Existing Profile" and sign in with your Xfinity ID to link the accounts.