This is absolutely fine, I think of the hundreds of people I taught, I would say 5-10% simply didn’t not catch on at all, no matter my angle of teaching. In those cases I would focus on relaxation above all, like you already gathered yourself.

That said the different pathways to the experience you would call deep meditation is very diverse, and sometimes it’s also a phase/station of life people need to be in. In old texts these things are often described as different temperaments, so I doubt it’s a new thing :D