Cisco AAA/Identity/Nac :: 3650 - 802.1x Multidomain Not Working

I configured multidomain on a Cisco 3650 port (12.2(53)SE1), and connected a 7941 Phone and laptop behind it. The phone gets successfully authenticated but the PC does not get fully connected. The PC adapter´s icon shows a "authentication error" message. The same PC, connected to another port (same commands except "authentication host-mode multi-domain") works perfect, including new VLAN and ACL assigned from ACS.
 
This is the configuration on the switch port where the PC chained to the phone fails:
 
interface FastEthernet0/6 switchport access vlan 701 switchport mode access switchport voice vlan 123 authentication event fail action next-method authentication event server dead action authorize vlan 704 authentication event no-response action authorize vlan 701 authentication host-mode multi-domain authentication open authentication port-control auto authentication periodic dot1x pae authenticator dot1x timeout tx-period 60 spanning-tree portfast
 
This is the configuration on the switch port where the PC without a phone works OK (exactly the same config, except for multidomain):
 
interface FastEthernet0/7 switchport access vlan 701 switchport mode access switchport voice vlan 123 authentication event fail action next-method authentication event server dead action authorize vlan 704 authentication event no-response action authorize vlan 701 authentication open authentication port-control auto authentication periodic dot1x pae authenticator dot1x timeout tx-period 60 spanning-tree portfast When the PC fails to get connected, I see the following messages on the switch:
 
Sep 17 18:36:18: %DOT1X-5-SUCCESS: Authentication successful for client (0023.aeb8.ce44) on Interface Fa0/6 AuditSessionID 0A01460A000000310080FDFCSep 17 18:36:18: %AUTHMGR-7-RESULT: Authentication

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