If you do not receive and enter the code within the 20-minute time limit please try requesting another. They can take 1-5 minutes to arrive.
You may also want to check in your Junk/Spams folders as sometimes it can be filtered. We would also suggest searching for "firstname.lastname@example.org" in case it may be hidden in another location.
If you are having your items sent to a work or business email you may also want to check with your I.T. department to see if you have any emails being quarantined.
If you have checked all items listed above please reach out to your Accounting Firm for further assistance.