Back in 2022, I did a bunch of research before actually signing up for Medicare. Then when the beginning of my enrollment period happened, I was tired from all the research. So I let everything lie there and waited until the beginning of April to enroll for coverage starting May 1, and wouldn't you know, there was some sort of glitch that was preventing people from being issued Medicare numbers. Not receiving the card, but being issued the number. And you have to have a Medicare number to buy a supplement.
It caused a tense couple of weeks that could have been avoided if I'd signed up for Medicare on the first day I could, just to get it in place, and then started sorting everything out.