Applying a discount for one customer

I have set up a discount and I want to apply a restriction to only one customer but the users drop down is only showing 3 of the customers not all them.

What am I missing?

Hello,

So I guess that you have more than 3 customers (or HikaShop user) take care to don't mix up HikaShop user with Joomla User, it's different.
Once that check is done, can you provide your Joomla and your HikaShop version, and your discount setting screenshot.
Awaiting news from you in order to get the root issue.
Regards

LOL - I just took another look - I did not realise that the pop up was scrollable. There is no indication on the box that you need to scroll. As always thanks for the prompt response!