Email address is unknown

I used my AppleID to pay for my Cointracker basic membership. Well sure enough I requested my tax documents and they were sent to email address : exapmle86r83658763@privaterelay.appleid.com

I did not think by signing in and paying for my subscription with my Apple information this would happen. : (

I have no clue how to accesss that email address. Does anyone have any ideas how to fix this issue by chance?