email received for team builder testing, but not with my actual account

I just received an email which allows me to test team builder, but through my euw acc, and not my na acc with which I got access to pbe. The problem is, I didnt got access through my euw acc, but it says I have to sign into the pbe with my account. Is this because my na and my euw account have the same email or is it a bug that I cant play through my euw account?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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