Oft-en with a pronounced 'T' is perfectly acceptable. So, don't worry
Pati. It is definitely an alternative pronunciation and not incorrect.
..
In message . net, Pati
Cook writes
LOL That is a pet peeve with me... in the opposite direction, Pig.
I started pronouncing it before I knew the "t" was supposed to be
silent. I learned to read phonetically, and it is written as "oft-en"
so obviously that is how it should be pronounced. BG I have cleaned
it up mostly, but if I am tired a soft "t" sound does happen. (And at
one point anyway, that was a secondary pronunciation.)

Pati, in Phx with a DH who is a writer, who can sometimes spell but
not pronounce words. (But thank goodness for spell check for him
too....)
--
Best Regards
pat on the hill