Audio jack not working

Question

I have the Xiaomi Redmi Note 4, however I am not sure that this is a hardware specific issue. The phone is a day old, so I don't know if it should have been working before.

Xiaomi support lines are reportedly bad, so I won't try, especially since I can't find their support email / ticket site in the first place... cough

When I insert an audio jack (headphones, tried two pairs) no audio is played through them, but instead, continues playing through main speakers.

System information: https://i.imgur.com/ZjRi8cf.png

Device Android ID/Codename: Nikel

Android: 6.0.1 MMB29M - MIUI8

Patch Level: 2017-04-01

MIUI Version: MIUI Global 8.2 Stable (8.2.5.0 MCFMIDL)

CPU: Octa-Core Max 2.00GHz

RAM: 3.00 GB

Internal: 32GB

Kernel: 3.18.24-perf-g798c6bf

Is this a hardware issue, or a software issue?
If it's software, what should I do to fix it, and is this a known issue?

This phone is NOT rooted... yet...

— spikespaz | Sources

Answer

Seeing that it works (see question's comment), this answer is somewhat unnecessary, but for the future in a Q&A fashion, I'll put in my 2 cents.

There are a couple of things to know here. Glitches happen, and stuff breaks. We obviously prefer the first. Here's a couple of steps to isolate the cause.

Quoting the IT crowd "Have you tried turning it off and on again?". Seems dumb, but it works. If this fixes it, it's a software issue. (Hopefully one you won't be seeing again)

Quoting the IT crowd again, "Is it plugged in?". Check that the connections inside the port are clean and nothing is stuck in there. Don't go sticking anything wet in there, but maybe a very very mildly damp q-tip could do the trick.

If neither of these do anything, try a factory reset. If that doesn't work, it's hardware damage.

— Ethan Z | Sources

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