Hello VAD,
As Nathan commented only an Empty Port Description (TLV length 0 ) within an LLDP packet would cause the phone to ignore it.
In regards of Ignoring the LLDP packet it simply ignores its own Packet as you can see it is a Polycom MAC.
Looking at a working scenario (at the end without TLV aka not working to yours) it seems yours contains much more details and is in a different layout:
Looking at your MAC the phone was sold by ScanSource Video Communications Sarl back in 15/01/2014 so it is well out of warranty.
Your reseller can open a PPI / Pay Per Incident Ticket for you in case you want our support team to look at this.
We do not have any issues using normal switches to get a VLAN via LLDP so unfortunately you on your own.
Have you looked at the DHCP VLAN options instead?
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Best Regards
Steffen Baier
Polycom Global Services