With PC it is just enablecheats thepassword here
Then press enter.
You do not get a confirmation. Once you do the command try an admin command.
You could also set a new pass, and click save. It could be that your browser or app saved an incorrect pass.
I would also recommend setting up Method 2 from this link. Also enable Creative Mode on the server. Then you can go into admin and mode to do anything faster.
Thanks. Got it working!