From the Welcome Bonus T+C: “A Qualifying Direct Deposit is a single ACH transfer of $500 or more from an employer or the government for a paycheck, pension, government benefit (such as Social Security), or tax refund. The following are not Qualifying Direct Deposits: person to person transfers (P2P), demand deposit account to demand deposit account transfers (for example, from a checking account to another checking account), and deposits or ACH transfers not from an employer or the government (for example, online transfers or bank transfers) ….”.
So, a transfer from an employer or the government.
As this offer is relatively new, we won’t know for a while whether other ACH transfers can actually trigger the bonus (regardless of the T+C, or confirmation emails) as it will apparently take 8-12 weeks to post