I leveled my character up to lvl 3 upon completing our recent campaign and the subclass options appeared available for my character.
I started reviewing all of the options, there were 4 subclass options:
   Beast Maester, Gloom stalker, Fey Wanderer, and Hunter
After reviewing the options and stats my options disappeared.
Now the only subclass option available to me is Hunter.
I have tried signing out and back in, resetting my devices, closing the browsers, trying it on the mobile app, as well as resetting my class level with no success.

I think it is a bug but unsure if there is a way that I can resolve it 

Quote from quincycoyle >>

I leveled my character up to lvl 3 upon completing our recent campaign and the subclass options appeared available for my character.
I started reviewing all of the options, there were 4 subclass options:
   Beast Maester, Gloom stalker, Fey Wanderer, and Hunter
After reviewing the options and stats my options disappeared.
Now the only subclass option available to me is Hunter.
I have tried signing out and back in, resetting my devices, closing the browsers, trying it on the mobile app, as well as resetting my class level with no success.

I think it is a bug but unsure if there is a way that I can resolve it 

This might happen if you've lost access to the 2024 Player's Handbook for some reason. Do you own that book or just have access to it through content sharing? Is the character still connected to the campaign?