First off — Welcome to the forum! You’re are going to learn sooooo much by coming here.
Secondly - Congrats on the new card
Citi, even their secured division, can be very picky. It’s a good bank, sometimes a stingy bank lol, but still a good bank.
As far as your question, what you’ve described is real, but varies by bank. My Fifth-Third Card does not update on my reports when no balance reported in that particular month, however I see regular monthly updates from Citi on all 3 of my cards, and I’ve never carried a balance on all theee at the same time. I think you’re safe with Citi. Again, YMMV
I’m sure there are a few guru’s here who will set us straight. Congrats again!