2016 based public folders Synchronization job gives the error "Couldn't connect to 'servername'" (4327942)

When adding a new Public Folder Synchronization job the configuration fails to connect to the 2016 server's public folders giving the error below:

Additionally the EMWMigration.log will contain lines similar to below

2017-03-07          11:16:31.3912     Px1540  Tx1         A-           C-            M-          Info                aeEMWGUIForms.CMapiSettings.GetExchangeAdapter: |Connect to RSEXCH2016 with account:exch2016\ex               

2017-03-07          11:16:31.4225     Px1540  Tx1         A-           C-            M-          Error                aeEMWGUIForms.CMapiSettings.GetRootFolder2: |-2146233088-There are no public folder servers available., (Couldn't connect to 'RSEXCH2016')   

2017-03-07          11:16:31.4225     Px1540  Tx1         A-           C-            M-          Error                aeEMWGUIForms.CMapiSettings.GetRootFolder2: |0-Couldn't connect to 'RSEXCH2016', ((null))

The Exchange account used for public folder synchronization must be mailbox-enabled to be able to obtain the target public folder hierarchy 

Reference: https://support.quest.com/technical-documents/preparing-migration/8.13/system-requirements-and-access-rights/17#TOPIC-529317

To resolve the error mail enable the service account in the 2016 exchange server.  Using the EX account example from the above log extract, 

1) Open Exchange Management Shell

2) Enable-Mailbox -Identity EX {the exchange service account name}

3) Recreate the public folder synchronization job