Hi there ,
You can absolutely use tubeless tyres on steel rims , and there won't be any problem . My 2004 Honda City has Goodyear tubeless tyres on the company fitted steel rims and I have been using them for 8 years now . No issues of any kind .
The only thing to keep in mind while using tubeless on steel rims is to make sure that the steel rims are not bent or damaged in any way and they are rust free.
If the steel rims are bent , then they should be straightened out with a rim straightening machine ( German made ) , not some guy with a hammer
But since you bought the rims brand new , so don't worry , just put on your tubeless tyres on them and drive worry free . BTW
, what was the brand of alloys were you using that cracked ? and how ?