Please first begin by checking that you have the
setting enabled. Tempo will
not automatically delete his own messages without this.
To enable the setting, run the following command
>settings autodelete on
will enable the auto delete feature.
If Tempo still isn't deleting messages then that means he doesn't have Manage Message permissions for either
the server or the channel he's in.
You can give Tempo additional permissions by right clicking your server, going into roles,
clicking on Tempo's role (which should be called Tempo) and granting required permissions in there.
If Tempo still says he doesn't have permission then it's likely that you have a channel override which
is specifically denying him that permission. To grant a channel override, right click on the channel
he doesn't have permission for, click Edit Channel, click Permissions, and then click on the
icon next to Roles/Members selecting Tempo's role and granting him the permission.