The FCC published a rulemaking notice that email addresses will be required on applications. When you include an email address they will send a link to an official copy of your license grant. You can also update your ULS listing with an email address when you log in.
Effective on June 29, 2021, amateur radio licensees and candidates must provide the FCC with an email address on all applications. If no email address is included, the FCC may dismiss the application as “defective.”
For more information: http://www.arrl.org/news/fcc-to-require-email-address-on-applications-starting-on-june-29-2021