The phrase "although I asked him" is correct and usable in written English.
It can be used to introduce a contrast or exception in a statement, typically indicating that something happened despite the request made.
Example: "Although I asked him to help with the project, he decided to work on his own tasks instead."
Alternatives: "even though I requested him" or "despite my asking him".
Storyboard has told interviewers that he is schizophrenic and bipolar, although when I asked him if a doctor had given him an official diagnosis he shook his head.
When I called my credit cards it was also a 2.5 foreign transaction fee that they applied on top of whatever exchange rate they were charging (although he became very confused when I asked him how they set their exchange rate... I guess you can't have it all).
"We're just about to tell the world," Solem said when I asked him about this, although the three companies sponsoring the Vista dataset are probably good guesses.
However, although I asked her to make some coffee for my guests, I was really sorry for asking that of her at the time".
Did he have fun making this movie, I ask him, although he looks so glum it seems like it's a very long time since he had any fun at all.
Although I asked (politely, delicately) several times, their replies were always oblique.
So, although I asked the executive not to take that position, I didn't go into the ditch to die for it.
Although I asked several employees at three different stores where to find a full-length mirror, no one offered to act as escort to the right aisle.
"Is Steve Bannon a white supremacist?" "Again, I don't think he's a white supremacist, although I've never asked him if he's a white supremacist," the Mooch replied.
Mr. Slatkin is evidently up to his old tricks, loading his programs with New York premieres, although Carnegie Hall asked him to cut back a few years ago.
Siu only has one version of the Touchy camera, although people have asked him before about buying one as a toy.
