how do I get the alarm to sound through earphones?

Hello:) Give this a try:

Open the Clock app, tap the Alarm tab, then tap Edit. Tap the alarm, then tap Sound and choose a Sound. If you connect headphones or speakers to your iPhone, the alarm plays at a set volume through the built-in speakers on your iPhone as well as wired and wireless headphones and speakers.

*How to set and manage alarms on your iPhone - Apple Support*

~Katana-San~

Hello:) Try this:

You could mute the voice before inserting the earphones and then put in the earphones and set the volume. This way the alarm sound will only come through the earphones because you have muted your phone, not the earphones. There are also some apps that may help. Check out Alarmy in App Store.Good luck.

~Katana-San~

Hello again:) Sorry you are still having a problem. At this point I think the best option is to go to upper right and click on Get Support. If you get it solved will you post back as I would like to know how things works out for you? Good luck.

~Katana-San~

Hello again:) What kind of earphones? We will keeping working on it.

~Katana-San~