Find out who gave an admin more rights in AD-Manager

Find out who gave an admin more rights in AD-Manager

We have about 200 Admins in our setup in which 10 are SYSADMIN for the domain. Each admin was given the rights of a role on specific OUs. As a routine check, I found that one of the admins were given rights to far too many OUs and I now need to find out which SYSADMIN did that. The Audit log seems to only show tasks performed in the AD, but what delegation tasks were done on the admins.

Where can I look?
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