Are the 3 Nested hosts running on the same physical host?
Ive included a good blog below which runs through running NSX-T Nested
You don't need edge for TEP communication between TNs to occur. Check VLAN and tagging on your uplink profile. In the uplink profile transport VLAN should match the VLAN you are using for TEP.
I have enabled MAC-Address-Change & Forged transmit setting on Base ESXi
Thanks for your reply