Does that appear after the payment completes?
Discussion
I've reproduced it 3 times now. 2 of the times, zeus responded first. The middle time, mutiny responded first. All times were really slow.
lnd logs don't really show anything out of the ordinary. I don't getting this error paying to other sources.
Using "Bitcoin Atlantis" (120879c1233789679a4ed9b47ba557f8da3d4577b4e0b3f61fa5afd3137b824a)
Just sounds like a payment slowness. Not an LNURL problem, just lightning liquidity issues. We don't run the federations or lightning gateways, so nothing we can do here.