Here is a screen recording. Note my mouse is over the sign in and then as soon as I click it it gives me the error. (I also turned off the retailmenot extension, and I got the same result).

(Click video to play)

Below is a screen shot if it helps, I think it is odd also that I get a translate pop up from Danish to English

(In case you needed the complete url it redirects me to, here it is

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