"Did not receive a response from Discord"

[CosmicDev-Official]

Using slash commands, when I was using 2.0.0 with "channel.slash_commands()" it would return empty with 0 commands, so I upgraded to 2.1.0 and now I can get the command but when I try sending it, my try-catch statement outputs:
"Did not receive a response from Discord"

        command = [cmd for cmd in await channel.application_commands() if cmd.name == serverInfo["command"][1:]][0]
        await command.__call__(**serverInfo["slash_command_arguments"])

"slash_command_arguments" is a valid key-pair dictionary with arguments, no issue there. So is serverInfo["command"]. The command is found but when trying to call it it won't send.

I've also tried using just 'await command()' instead of 'await command.call()' and it makes no difference.