Everyone who has problems logging in from your phone, this is what I figured out because the instructions in the OP of this thread did not work for my phone.
1. Open Element Classic app
2. Manually change "matrix.org" to "t.vultustemplorum.org"
3. Use your associated email address to log in, not your username (username didn't work for me).
4. Enter your password [Note: some members say they had to press "forgot password", I didn't have to. It let me log in smoothly.]
5. There will be a prompt to check your email for a 6-digit code
7. Type in that code
8. Accept Element to connect with t.vultustemplorum (otherwise it won't work)
9. Now you are in!
These are all the steps I remember, if there are more please let me know so I can edit this.