if they are buried under soil, how do you know they are not growing?
first, relax. take a more hands-off approach. your blood pressure will go down.
while underground, you don't need a humidity dome. You'll need that for when it sprouts, if you choose to use one.
it's possible you buried a little deep and it's taking extra time to sprout, or did you possible tamp down the soil a little too hard and it's just slower at burrowing through it.
it's also possible that touching it and handling it after it intially germed caused a problem or any number of other things in the substrate.
after 10 to 14 days... you can assume it rotted under the soil. i wouldn't tamper with it until you know it's dead. don't dig around. don't htink you can do anything useful, because all you can do is wait. i'd suggest just putting it directly into substrate in future. fewer steps, fewer risks of contamination. paper towel method is for ppl with a preferred habit primarily becuase it is what they learned to do first or a personality prone to OCD :P there's no benefit to it, really and it's no faster... only introduces more risks from needless steps involving handling a delicate germinated seed.