This particular client is not using a branding domain. It's just a default setup. So we would use au-sn02.marketo.com/UnsubscribePage.html?mkt_unsubscribe=1 as the unsubscribe link inside the token?
Because we end up on a Marketo Error 500 page.
If there an equivalent setup we can use for {{system.forwardToFriendLink}} inside of the same {{my.edm_master_footer}} email script token?

Branding domains are for email click tracking. You're showing the LP domain setup, which is a different section (but may also be currently at its default).
Your Unsubscribe Page is like any other LP. It's at au-sn02.marketo.com/lp/797-CWU-691/UnsubscribePage.html.
I strongly recommend that you set up an LP (sub)domain under your client's domain, otherwise you will (a) not be able to track web activity as leads move from the LP domain to the client's www site, and (b) you will lose tracking outright if they visit other Marketo customers who also don't have a domain set. It's a lose-lose situation.
If there an equivalent setup we can use for {{system.forwardToFriendLink}} inside of the same {{my.edm_master_footer}} email script token? |
Sure, the FtoF also has a known pattern, which you can see by embedding the {{system.}} token and then copying the resulting URL into your Velocity token.