Iframe with username and password does not work

I want to have the growatt-plant-page (https://server.growatt.com/) as a webpage dashboard.
When I use this in a normal browser it works fine, When I use this address and add my credentials I get this message :
“Dear user, you are not logged into the system, skip login page login…
Page in 0 seconds after the jump to the login page.”
Under that is a hyper link with the text login page, when I use CTRL-click with mouse it opens the normal login page.
However it does not open a new login page

Anyone knows how to solve this ?