If you have an existing email through G Suite that’s connected to your domain name (i.e. firstname.lastname@example.org) you will need to let us know so that we can add the necessary MX Records so that your email continues to work correctly.
If this is a new domain name you are adding to G Suite or it is a new G Suite account, you will also need to verify your domain name. You will need to send us the TXT record for verification.
Please follow the instructions here to find your TXT record (see 1. Get your verification record) -https://support.google.com/a/answer/183895#generic_TXT