SBTPG has indicated that the IRS is not supposed to send deposits to them for round 2, and they are bouncing any deposits for security reasons.
https://www.sbtpg.com/coronavirus-stimulus-payment-info/
Normally, when the payment bounces, the IRS will send a check. However, they are not allowed to send out round 2 payments after January 15. If you have not received the payment by then, you can claim a credit on your 2020 tax return.