The invite code for Slack expires every 30 days. To generate a new Slack invite link as a Slack Admin:

1. Go to the dropdown menu at the top of Slack>Invite people to ACE>Edit link settings
2. Deactivate the old link
3. Generate new link
4. Set the link to expire in 30 days and save
5. Go back to Invite People to Ace and copy invite link

Update it in the team’s dynamic QR code site and the link on the contact page of the website.

Be sure to test the QR code to make sure the new link works.