Hard to say what the issue could be. The website gave me "payment status unavailable" for the longest time, then finally accepted my 2018 numbers (even though I paper filed my 2019 taxes in March) and took my bank information. Then it stalled me for another week or so . Finally, just a few days ago, it said I'll get a deposit tomorrow 5/6/20. So I don't know what else to advise other than to keep trying.
That's about what happened here, except we E-filed. I kept getting "payment status unavailable" until, like you, it said we'd get the deposit on 5/6/20 a few days ago. It showed up this morning.
It's already been earmarked for new a hardwood floor in the family room that DW has been wanting for several years. $2400 won't pay for all of it of course, but at least a good chunk of it.