We are looking at ObjectMerge as an option for Contact merge. I wanted to ask the community what do I need to be aware of when merging contacts?

Especially around:

1. Community users as we have two active customer communities (CCP and CP) with our org.

2. Duplicate affiliations

3. EDA objects and funky automation that we don't see on UI

4. Integrated with Identity Management system that passes two different Fed IDs for the two contacts that are same but two community users from different communities.

Thanks for your input in advance!