Example of the invitation e-mail to join the private group to download the badge

Hello, do you have an example of the 2o email we receive after opt-in?

I mean, the separated invitation e-mail to join the private group. 

I have the access to the group , but I can't find the email invitation to be able to orient my peers.

I just found the 1st email aknowledging my opt-in and with this phrase: "...stay tuned for a separate invitation e-mail to join a private group where you can take advantage of this mechanism and share your accomplishments with colleagues and social networks around the world!"

The "From" and "Subject" should be enough.

From: ....

Subject: ....