How you provide full permissions to a Sage Intacct sync user depends on your Sage Intacct account setup. 

User based

1. In Sage Intacct, go to Company > Users 
2. Locate the user billcom, and click Subscriptions 
3. Make sure all Modules are selected
• Click each individual permission and select All
4. Click Save
5. Sync again

Subscription based

In a Multi-Entity accounts, you must create a role with full permissions, and assign that role to the billcom sync user.

1. In Sage Intacct, go to Company > Roles
2. Locate the billcom role and click Subscriptions
3. Make sure all Modules are selected
• Click each individual permission and select All
4. Click Save
5. Go to Company > Users
6. Locate the user billcom, and make sure it has the billcom role assigned
7. Click Save
8. Sync again