You should receive your advance within 48 hours of acceptance of your tax return, on the temporary card from the time your return was accepted.
Please make sure you check your junk/spam folder. The sender will be firstname.lastname@example.org.
Please refer to the following help article for more information.
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Update: I applied for the refund advance and it said that I would receive my refund within 1 hour. I received it in about 6 hours. I got an email confirmation about my available funds on my temporary card.