Summary
Check spelling, spam/junk, and any security filters. If needed, resend or create a new self-verification. If you chose Send to myself, confirm your inbox and try resending to a different address.
Steps to try
Check the email address for typos.
Ask the recipient to check spam/junk and any quarantine (e.g., security gateways).
Note: Some organisations block external emails by default; if so, Send to myself and upload/forward the PDF as the recipient instructs.
If you’re unsure you submitted, open your original link and check the end state (confirmation vs steps).