Azure B2C User Flow - no e-mailadress in registration e-mail

Question

Hi,

i use Azure B2C to register users for my WebApp. I have an Flow type "Sign up and sign in (Standard legacy)". Which sends an e-mail every time a new user is registrated. This worked great until the beginning of this month, like this:

"A new user has registered with the email address user@email.com."

But i get this now every time someone registers:

"A new user has registered with the email address undefined."

Is there an update i missed?

Also how can i edit this e-mail, i want to add the name.

best regards!