Why won't my wifi connect on my phone, but all other devices are fine?

Just before christmas, me and my boyfriend moved in with a friend of ours. Obviously, I connected to the wifi, and all was well until I came home from work early this morning. It hasn't connected all day, and it's extremely frustrating. I should note that our housemate has friends down, is there a limit to the amount of devices that can connect?

At first every time I clicked on the name to put in the password, it would disappear and then come back, then it had started saying "authentication error", now it keeps disappearing again.

I have tried turning the wifi off and back on again on my phone, doing a soft reset, manually inputting the network etc.

I'm on my last tether and don't know what to do anymore. I've tried uninstalling apps and turning off wifi on other devices, does anyone have a solution that works?

(I have a Samsung J3)

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