Cookies stoped working when upgrading from 14 to 15

[Per Waernborg]

I use cookies to remember the login and has a working app made with Delphi 10.1.2 and IntraWeb 14.1.7. It writes and reads cookies just as I want it to.
When I move this app to Delphi 10.2.3 and IntraWeb 15.0.15 the cookies don't work any more. 

I have the following settings in the ServerController:
AllowMultipleSessionsPerUser = False
CookieOptions
> CookieNameSuffix = "empty"
> HttpOnly = False
> SameSite = ssoNone
> Secure = False
> SessionCookies = True
> UseCookies = True

Are there any other settings I should check or is it someting else I should be looking for?