A small addition: We need domain1.com accessible as well as domain2.com. In the mapping plugin, I believe this is the setting that reads “Redirect administration pages to site’s original domain (remote login disabled if this redirect is disabled)”
Thanks for the quick reply. I confirmed the method you mentioned in our test environment and it matches how we manually created it.
We just manually added the columns in the database. I’m not sure why it didn’t do the update when the plugin was upgraded, though.