does an account manager have permission to cancel service without primary user?

Managers — Have access to services, settings, and billing.
Members — Have access to troubleshooting and Xfinity apps.
Viewers — Have access to Xfinity apps.

For information about what each role can do, see the simplified user roles and permissions. Only a Primary user can transfer Primary user functions to an existing Secondary user. The original Primary user then becomes a Secondary user and will lose full access to the account. They will no longer be able to:

• Create and manage secondary accounts and users.
• Manage product features.
• View and pay bills (unless designated as a Manager by the new Primary user).
• Access online voicemail (if you have Xfinity Voice) until the new Primary user restores access.
• Manage and pay the bill associated with the Xfinity Mobile account (if subscribed).

Changing the Primary user role doesn't transfer financial responsibility or ownership of the account.