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something similar happened to me, just waiting for any response from EA :(

How did you contact them? Ive been trynna find some EA support

I had the exact same issue. I was recently selected after years of waiting and out of my own excitement and lack of thinking, I accidentally entered a PSN account that is no longer associated with my EA ID. I reached out to EA Support to inquire about changing the account information on my playtest acceptance form and they said nothing can be done. I’m extremely disappointed to say the least 

hope you have a great day today

I was able to get in!!! It is a great day indeed! I hope you have a great day as well