Cannot create new network interface

Hello piguyareme,

Thanks for posting in the Apple Support Communities. We're happy to look into this with you. We understanding that you're attempting to create/set up nework services on your Mac. Are you following the actions from article, Connect your Mac to the internet using PPPoE - Apple Support? If not, this is the best place to start in looking for a solution.

1. On your Mac, choose Apple menu  > System Settings, then click Network  in the sidebar. (You may need to scroll down.)

2. Click the Action pop-up menu  on the right, then choose Add Service.

3. Click the Interface pop-up menu, then choose PPPoE.

4. Click the Ethernet pop-up menu, then choose an interface for the PPPoE service (choose Ethernet if you’re connecting to a wired network or Wi-Fi if you’re connecting to a wireless network).

5. Enter a name for the PPPoE service in the Service Name field, then click Create.

6. In the network service list, select the new PPPoE service you just created, then click the Advanced button.

7. Enter the information you received from your ISP in the PPPoE Service Name, Account Name, and Password fields.

8. If you need to enter IPv4, IPv6, or router settings, click TCP/IP in the sidebar, then enter the information you received.

9. If you need to enter DNS server or search domain settings, click DNS in the sidebar, then enter the information you received.

10. If you need to enter WINS settings, click WINS in the sidebar, then enter the information you received.

11. If you need to enter proxy server settings, click Proxy in the sidebar, then enter the information you received.

12. Click PPP in the sidebar, then adjust any of the settings as needed.

13. Click OK.

Best regards.