99% of the time this happens when the person the folder is being shared with is not yet provisioned with access. If they have a link to the folder, let them request access to it. It should send an email to all editors/owners who can then chose to grant access.
99% of the time this happens when the person the folder is being shared with is not yet provisioned with access. If they have a link to the folder, let them request access to it. It should send an email to all editors/owners who can then chose to grant access.