Are there any benefits for a brown skin african american to use a tanning bed?

No. Tanning beds are artificial intense uv light. Most tanning beds today are uva type, that allows tanning, but also greatly accelerates aging, wrinkles, sun spots and abnormal pigmentation. Darker skinned people who use tanning beds are not getting any benefits (maybe some extra vitamin d) but instead are accelerating aging and wrinkles and maybe even increasing their risk of getting skin cancer.