Idle Master not working

All I can say is you're among the lucky ones: it hasn't been working properly for the majority for ages, and it's been long since it stopped being supported.

Long been broken. Use ArchieSteamFarm instead. I was an ASF doubter up until I was forced to use it because IM stopped working.
That being said, it is a much better option and it really is not hard at all to setup. If you can watch a video and listen to a few instructions along the way, you'll be up and running in no time.

Idle Master is "abandoned". Use ASF instead.

utiliza idle dady de celular esta el mismo bug de idlemaster de sacar los cromos rapidos

use idle daddy

Try a fork of the original (use at your own risk):
https://github.com/Farax85/idle_master/releases

Use ASF instead :D

Don't use ASF, it requires you to have mad hacking skills like knowing your username and password. Nobody should be required to do that much work to get their cards.

there's idlemaster extended, give it a try https://github.com/JonasNilson/idle_master_extended/releases
not sure if it's updated, i haven't idled in months.

Get Archi😆

Just use Archi steam farm

Guys idle daddy seems to be working fine. What is more, you can use it from your Android or i phone.

Use SingleBooster, that's a pretty good alternative