New Dachshund puppy – enforcing daytime naps

This is going to be super long and if nobody reads/responds totally understand.. just need to vent lol I’m new to Reddit and this is my first post so please be kind if this is read :,)

New dachshund puppy owner, we have had him for 3 weeks he’s about 3 months old now and OMG it has been tough. Like we did our research and knew it would be a ton of work we aren’t shocked about that it was expected, I guess it was just more than we even expected. So when he’s good, he is so lovely and a joy to be around but when he’s not…. Oh lord it is rough. He seems to be on a better schedule with me than my husband, I enforce naps more and am a bit more strict. My husband tries so hard he really does but he just does not nap when he’s with him and I don’t understand. And then I get frustrated telling him he isn’t doing enough or it’s not the “right” way and then we fight… I feel bad because he doesn’t deserve that because he is trying and I continuously tell myself that. I always get nervous because I see how puppy’s need 18-20 hours of sleep daily and I know our pup is not getting this as hard as we try. We crate train him and when we go to sleep at night he’s amazing he will basically sleep through the night and not cry and is just a great boy. But during the day…. Trying to enforce naps can be a hit or miss. We put the crate in our bedroom in the dark with the white noise machine, we use snacks, toys (calming toys) and try to make it as comfy as possible. Of course I have to literally sit with him until he falls asleep or he starts losing his MIND which in itself is sooo annoying but whatever it is what it is. But then at the same time I worry because I know they are prone to separation anxiety and the last thing I want to do is be a reason my dog does not turn out to be independent and untrainable. I constantly go back and forth with these emotions like what am I doing wrong, I am trying so hard and don’t want to screw it up or screw him up… soooo some advice and have others struggled with their pups not wanting to take their naps during the day?? Also one last thing to point out sometimes of course he is good and we’ll get him to nap but for those times it’s difficult that’s why I’m reaching out. This was very long so yeah thanks for hearing out my venting lol