Does the user account you use for Composer have the correct permissions on the problematic domain container/OU and any necessary child objects in that domain?
Required permissions for the account on the OU are:
Read All Properties
Write All Properties
Create Computer Objects
Delete Computer Objects
Yes it does. I actually copied the domain administrator when creating the new ID to use for composer. It is setup like all the domains. The DNS is correct. The trust verified. I have tried using the domain admin account and then creating a new domain admin account for this.
I can add it under the view composer settings
i just cannot use it under the entitlements (not listed in drop down), nor under the guest customization. That is why i thought maybe there was a limit as my company has acquired a few smaller ones and we have (with this domain) a total of 6 listed now.