I don't think it was ever available everywhere.
In that channel range it probably was a LOCAL subchannel. If the local in your area dropped it, then it is probably gone.
Looks like it has moved to channel 480!
Did you check the messages on your stb?
They typically post there about channel changes.
I have no answer, just weighing in that I watch NHK incessantly. Ch 480 is RTN-E (???) please bring it back
Not sure where in MD you live, but I just tuned to 480 and nhk world was on.
It is on 481 and 482.
Enjoy!
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