Our clients have had many synch issues using OneDrive for Business (ODFB) so we have complied a list of best practices to help users avoid having problems.
A lot of OneDrive for Business synch issues revolve around credential conflicts. If you are using more than one browser the credentials get cached and OneDrive for Business gets confused. If you use both OneDrive (OD) and OneDrive for Business (ODFB) on the same machine this can also cause confusion. If you use the same browser you must use a Private Browser Session to sign-in to OneDrive(OD) and another Private Session to sign-in to ODFB. Otherwise use a different browsers to sign-in to OD and ODFB. For example use Google Chrome to sign-in to OD and IE to sign-in to ODFB. Try to consistently use the same browser for each.