[NAME]-Chris H​ Hi and thank you for your help! I contacted support and after reading the configs and tech-support output they figured out the issue. I didnt use the same VLT-MAC (virtual mac) on both VLT-peers. When I fixed it everything went up as expected! I think I had a minor brain breakdown. I have a few of those VLT-domains setup and I havent done this error before! now all is good! 
Hi! I have a few DELL switches setup as VLT domains in the environment I’m managing.  I recently got 2 new S4112F switches and set them up exactly as I have done before with a new VLT domain.  I got one “4-port portchannel” (2 ports in each switch) going to another VLT domain and that is up and running on all 4 ports.  I configured a portchannel on a single DELL N1524 and connected one port to switch 1 in the VLT domain and one port to switch 2.  The portchannel goes up but only one of the physical interfaces.  I get the following message in the logs of the N1524.  mmxsw26-1 DOT3AD[dot3ad_core_lac]: dot3ad_lacp.c(2339) 845 %% WARN Interface Te1/0/1 partner priority 4096 is not same as existing members of LAG interface Po1 (4096). Not adding interface Te1/0/1 as active member of LAG interface Po1. I have googled the logged message and it leads me to a few posts in this forum but none of them seems to explain what the logged massage means.  I have checked and double checked the configurations, and everything seems to look as it should.  I have other VLT switches setup to other N1524/1548-switches and they are ok.   Any pointers? What should I look for? If I bring down the active portchannel port the inactive one goes up. If I bring that interface up again, I get the same message in the log but on the other interface. 
VLT issues DELL S4112F / DELL N1524 (+ others)