Problem with setting up a share with my MacBook Pro

I’ve been trying to set up a share between my MacBook Pro and my Apple TV and my iPad. I enter all the correct information and I’m getting the error message ‘Your username and password combination isn’t right’ which is baffling me because it is correct - i even changed the password and then tried again and still the same error message.

I’ve had no problems setting up a share between my Airport Extreme and my Apple TV (new model) and iPad and its working fine.

I have checked all the SMB settings on my MacBook and they all appear to be correct - I’m at a loss - can anyone help?