The mail you should be looking for, was sent from email@example.com around 17.00 yesterday. If you cannot find it or need support, you can contact the app producer AIM at the same address.
The mail had this content:
As part of the conference app, Radiodays Europe are offering a messaging service between all delegates and speakers. The service allows you to strike up conversations, continue discussions after sessions and get to know delegates from around the world.
To access the messaging service, download the Radiodays Europe app and enter your unique PIN shown below.
Your unique access pin
< xxxxxx >
Your PIN is case sensitive
By using this service, you agree to the Radiodays Europe Terms & Conditions.
For support, please contact firstname.lastname@example.org
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This is the mail you should look for in your mailbox. It went out Wednesday around 1700 and was sent by email@example.com to all registered delegates to the conference. If you did not receive it or need support, contact the app producer at this same address.