Application Specific Password
Generating an application specific password in my ShareFile account resolved this for me and was specifically due to that two-factor was enabled/enforced.
sharefile_client_name/[email protected]
u3f678ae36
open command.
ftps command!
open ftps://username:[email protected]
Connecting to ouraccount.sharefileftp.com...
TLS connection established. Waiting for welcome message...
Access denied.
Credentials were not specified.