Why is my Federal return being mailed?

[QuickQ]

I selected to have my refunds direct deposited. My State refund was deposited directly, but using "Where's My Refund?" shows that my Federal refund was mailed. Why? Every explanation I see says:

There are three possible reasons. They are as follows:

• We (IRS) can only deposit refunds electronically into accounts in your own name, your spouse's name or in a joint account.
• A financial institution may reject a direct deposit.
• We (IRS) can’t deposit more than three electronic refunds into a single financial account."

Well, since my State refund was direct deposited without issue, obviously the information I provided was correct, so the 1st one does not apply. Looking into the 2nd possibility, it pretty much says a financial institution will only reject a direct deposit if the information does not match what is on the account. Which again, does not apply. And I am only receiving 1 refund from State, and 1 from Fed, so the 3rd does not apply either. So why is my Federal refund being mailed?

UPDATE: I received a letter from the IRS stating: “We had to do some additional processing on your tax return. Therefore, we weren’t able to honor your request for direct deposit of your tax refund and are sending you a check instead.”

[rjs]

Occasionally there are unexpected and unexplained hiccups in the direct deposit process. If it doesn't work the first time, the IRS mails a check.

Did you e-file or file by mail? If you mailed your tax return it's possible that the IRS data entry clerk who entered your tax return made a mistake entering the direct deposit information. A mistake at the IRS would not affect your state refund.

[HeatherPLO]

You would need to contact the IRS directly in regards to why your refund is being mailed.  Please see the following directions to reach out to the IRS: 

IRS: 800-829-1040  

Hours: 7:00 AM - 7:00 PM (local time zone)

Monday-Friday

• Listen to each menu before making the selection.
• First, choose your language. Press 1 for English.
• Then do NOT choose the first choice re: "Refund", or it will send you to an automated phone line.
• Instead, press 2 for "personal income tax".
• Then press 1 for "form, tax history, or payment".
• Then press 3 "for all other questions."
• Then press 2 "for all other questions."  It should then transfer you to an agent.

Or, you can visit your local IRS Office.

[QuickQ]

I e-filed for both :(

@rjs 

[QuickQ]

Thank you. Do you know about how many days it usually takes to arrive after the date mailed?

@HeatherPLO 

[cajuro]

have you double checked your return to make sure you did request direct depost?

[QuickQ]

Yep. My main "overview" page says it will be direct deposited, too.

@cajuro