Register APs at remote site with WLCs at the core via Metro E.

All,
I have problem with register APs at the remote site with WLCs at the core.
All of my WLCs are on main site; and the majority of APs are on same subnet and same site with the WLCs. This works just fine.
However I have a remote site with connected to the core via metro E. And I am unable to make the APs at this site register to the controllers at the core.
On remote site APs and PCs are on subnet. And PCs are work just fine. I have the DHCP scope options 43 set for the ip address of the WLCs.
Metro E interfaces are on 192.168.0.0 /24.
Clients (PCs and APs) at remote are on 192.168.56.0 /24
I have the configuration on the Metro E and and remote site on the attachment.
Thank in advantage.

To get APs registered, make sure AP is getting an ip address and can ping WLC
Once this is verified, run the following debugs on WLC CLI and attach it to the thread:
- debug mac addr
- debug capwap OR lwapp events enable
- debug capwap OR lwapp errors enable
- debug pm pki enable
To stop debug
- debug disable-all
In case you have 'console' access to remote site AP, capture AP boot up and then run "debug ip udp" on AP CLI
To stop this debug
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