'may I know' is correct and usable in written English. You can use it when politely asking for information or clarification. For example: "May I know what time the meeting is scheduled for?".
VERNITA: Be that as it may, I know I do not deserve mercy or forgiveness.
Referee: Andy Hall (W Midlands) 7 28pm: The inevitable email: "May I know all of the Champions League, Championship and FA Cup squads and referees for the respective matches please, Paul?" chuckles Chris Laws.
May I know that I am enough".
May I be happy, may I know peace.
To whom it may concern: I know Mr. Tangorra as long as my son has known him.
Which may, for all I know, be the point.
I know smoking may kill me, I know not to do it while pregnant and I certainly know not to do it around children.
Ludwig does not simply clarify my doubts with English writing, it enlightens my writing with new possibilities
Simone Ivan Conte
Software Engineer at Adobe, UK