Namibia's perfect record of five wins from five games has confirmed their spot.
The Eagles currently sit on top of the table with 10 points, with their win against Tanzania ensuring a top-two finish required to qualify for the showpiece event next year.
The fight for the remaining spot is still on, with Uganda, Kenya, Zimbabwe and Nigeria still in the reckoning.
Uganda and Kenya hold their destiny in their hands, while Zimbabwe and Nigeria rely on favorable outcomes in other matches.
The match between Uganda and Kenya is a do-or-die encounter.
Tanzania and Rwanda have already been eliminated from the competition.
This will be the third edition in a row that Namibia will be playing in the Men's T20 World Cup.
In 2021, they managed to make it to Super 12 after finishing second in the group stage but failed to do so last year.