Problems with cookies

Hello!

When anyone tries to login into the site, we get the notice that cookies are disabled in our browser and that we have to enable it. When we press Login the second time,
it logges in without any problem. I have already tried to fix it by disabling all plugins and that didn’t work. I already contacted my host and i’m waiting
for his answer. On some forums they say it might be a problem from the Theme, so that’s why i’m contacting you. Could you please check if
there is any solution avaiable?

Kind regards