How do I use Velocity Scripting (Email Script Tokens) with email tracking query string parameters?

[Sally_Duda]

We have multiple unsubscribe pages. I use an email script token for my unsubscribe links so that I can select the unsubscribe token based on the email audience e.g. I use one token for the US, another for the EU and so on.  When someone clicks the unsubscribe link, I want to track that they unsubscribed from the email in the Email Performance report but I don't want to track the click in the Email Link Performance report.

The URL without Marketo email tracking tokens is:

https://www.conference-board.org/subscriptioncenter/?mid={{lead.Marketo ID}}

Adding the email tracking tokens:  "mkt_unsubscribe=1&mkt_tok=##MKT_TOK##" in the actual email works as desired.

HTML (this works):

<div>You are receiving this email based on your relationship or past engagement with The Conference Board on this topic. To manage your preferences or unsubscribe <a href="https://www.conference-board.org/subscriptioncenter/?mid={{lead.Marketo ID}}&mkt_unsubscribe=1&mkt_tok=##MKT_TOK##" class="mktNoTrack" target="_blank" style="color: #3fa7cc; text-decoration: none;">click here</a>.<br /></div>‍

Velocity Script (this doesn't work):

You are receiving this email based on your relationship or past engagement with The Conference Board on this topic. To manage your preferences or unsubscribe <a href="https://www.conference-board.org/subscriptioncenter/?mid=${lead.marketoID}&mkt_unsubscribe=1&mkt_tok=##MKT_TOK##" class="mktNoTrack" target="_blank" style="color: #3fa7cc; text-decoration: none;">click here</a>.‍

How can I get this to work within an email script token?

The URL in the email script is:

https://www.conference-board.org/subscriptioncenter/?mid={{lead.Marketo ID}}&mkt_unsubscribe=1&mkt_tok=##MKT_TOK##

The script does not add the link to "click here" unless I remove "&mkt_tok=##MKT_TOK##"

Note: I  checked the Person fields for Email Address and a custom field called Marketo ID in the token set up.

I looked at the Velocity Script documentation and am wondering if I need to escape the "#" sign.  However, it's not clear to me how to do that with two ## next to each other. I've tried different combinations with the "\" but  I don't think the examples are directly related to what I am trying to do. I'm not trying to implement inside a macro.

Any guidance would be appreciated .