So I am constantly getting this message when working in Office 365 and On-Prem (exchange 2013) EAC
"the action can't be performed on the object because the object is being synchronized..."
Like I go to run an Exchange PS command or do something through the GUI but can't. Some users show up on both sides and some only on one or the other. Very frustrating.
For example, I went to add myself as a moderator on a Distribution Group in O365 but I got the error above so I go over to the on prem (enterprise) EAC and when the window comes up displaying user accounts, I am not there.
Any ideas very much appreciated.