Today I had the following issue at customer site ( German LP ):

The customer has embedded the AD via Directory Assistance. We created a new AD account and entered the mail address for some sync options.

Afterwards we tried to register the user in the Domino Directory and received the error message, that the Internet Address is not unique and therefore we couldn´t register the user.

Then we removed the mail address from the AD account, rebuild the XDir with a
“sh xdir r” and then we could register the new user without any problems.

So it seems, that during the registration process also via DA embedded directories are checked for duplicate Internet Addresses. I created a case @HCL – if I receive any informations I’ll update this blog entry.

UPDATE: I received the information from HCL Support that there´s an enhancement request which has been made public: https://bit.ly/30qOunW