How to give my team access to all channels?

This can be easily done by syncing role permissions

Enable permission syncing

1. Dashboard -> Select a Creator -> Permissions Tab -> Synchronize Permissions

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Set permission in category

1. All permissions you set in the category for roles will be applied and synced to temporary channels. Allow View Channels and Connect permission to allow that role to join temporary channels.

Permissions for @everyone

You cannot sync Connect, View Channel and Send Message permissions for @everyone, because these permissions are managed when using /voice privacy!

If your Discord server has a verification system and you want to prevent @everyone from using temporary channels, read How to integrate my verification system?