Unable to log into iCloud

[andy.barron]

Hi all,
I have an imac (Late 2012 running Yosemite 10.10.5).
I am unable to log into iCloud account with my user with the error 'your user ID or password was incorrect'.
However, I am able to log in on my iPhone, iPad & even my old Mac Mini (running 10.9.5).
I have tried creating new user, resetting apple i.d., deleting .pref files but to no avail.
Could somebody PLEASE help as I am at a loss
Thank you so much in advance.

 

[Bigwaff]

I have an imac (Late 2012 running Yosemite 10.10.5).
I am unable to log into iCloud account with my user with the error 'your user ID or password was incorrect'.

Put the 2FA code at the end of your password. Ex. mypassword123456

 

[andy.barron]

Put the 2FA code at the end of your password. Ex. mypassword123456

Yes have tried this but still get 'your Apple ID or password was incorrect'.
It isn't as my iPhone is connected?