Public folder migration 2010 to 2013 insufficient access rights

Hi,

I'm having a frustrating time with trying to migrate public folders. I've migrated all the mailboxes with no problems but when trying to migrate public folders with the same account it fails with this message;

Active directory response: 00002098: SecErr: DSID-03150BB9, problem 4003
(INSUFF_ACCESS_RIGHTS), data 0
 --> The user has insufficient access rights.

The account is in the organisation management and recipient management group.

I've tried ticking the inherit permission box in AD security.

I've tried creating a brand new account with the same permissions.

Nothing works. I'm tempted just to export to pst and import it to the public folder mailbox.

Any help would be much appreciated.

Thanks