Global variables working in table querry, but giving error in "Variables" section

Hello,

I started using these two Global Variables:
"Cash"__dashboard
and
"Cash"{__user.login}

When I add them to TABLE SQL - they work fine.
image
The problem occurs when I try to add them to “Variables”.
I get the following error:

Could You please assist me?
Using Grafana 7.1.5

BR, Oskars.