I can not activate an account

Dear all
I am new in Pangeo Cloud.
I have tried to open it via Pangeo Cloud — Pangeo documentation but I failed.
However, I have tried three different E-Mails.

abdelrazek.elnashar@uni-kassel.de
abdelrazek.elnashar@cu.edu.eg

Any assistance is much appreciated.
Regards,
Abdelrazek Elnashar.