What’s your reasoning for this?
There was still a thin veneer of Islam according to the rigorist practicioners and muslim traders in OTL in the Wagadu/Ghana empire. And it was accused by its rivals for stubbornly clinging to it even when islmazing was occuring. Even populations in Tekrur had ATR when Mali ascended. The region saw a good number lean towards more mixing or capturing bits of Islam and combining it in a way to negotiate it's existence with local religious authority and practices.
Now that's with a 8-9 century world, Arab-Berber leverage of trade routes and extensive reach across Europe, Africa, Western, Central and South Asia.
It's different from the in 300-600 ad.
I don't think you'll get much more than a nod, or maybe a tolerance for it from Sahelian traders within the time frame due that and possible competition between the different denominations. They'll probably undermine each other to the benefit of local leaders (pagan and secular).
Now, whether you consider it successful if some local leaders acknowledge your religion, make space for it, or baptize themselves could be arguable, but that might be just enough.
The local proselytizing and documenting might inadvertently influence the local ATR in a similar fashion the way Scandanavia paganism was altered. (Make it more conducive as a vehicle for later conversion to not be as wide of a bridge to cross.)
But thats how I think success will be considered.