So called 'duct tape' has not been allowed on duct work for years.
Foil tape MAY be approved in your are, but a mechanical fastener AND foil tape satisfies almost everyone.
I usually use pop rivets since they are flat on the outside under the tape.

No screws in Texas can extend into any ANY duct or vent.

MASTIC foil tape is acceptable..and it lasts!
I use Hardcast mastic tape, but there is also a
cheaper brand called Polyken..the mastic backing is thinner
than Hardcast, but price is cheaper.
Both are sold at hvac supply houses.
Surfaces have to be dry & clean. Tape should be pressed well to eliminate air pockets & provide a better seal.

Duct tape is for many other things (I reckon...) but not
for a long lasting seal on ductwork. It fails in 3 to 5 years. waste of effort although cost of tape is cheap.
I believe in getting it right the first time.
Best of luck.

Why is that, Bob? Lint build-up over the years?