Not able to see archived attachments in Outlook 2016

We recently migrated from Exchange 2010 to 2016 and now, after we moved the public folders, we have some issues with access to archived attachments. Outlook 2013, everything works fine. Outlook 2016/O365 we have some that work and some that do not, which is very strange. All our installs are 32bit. Everything was working when we were in hybrid between the two servers... What changed after the cut over and why is this working on some and not others? I greatly appreciate any thoughts..... Thanks 

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