Error Message from user trying to create new account

[Mikael_Baggström]

I got this screenshot from a person trying to create a new account on my forum. He told me in an email he has cookies enabled. Please help me figure out what could cause this?

[rorycb (Rory Craig-Barnes)]

There’s a very long discussion of this already…

https://meta.discourse.org/t/we-cannot-detect-if-your-account-was-created-please-ensure-you-have-cookies-enabled/