Your drug screen invitation expired or you cannot find a collection site
Last updated: September 21, 2026
Applies to: workers whose assignment includes a drug screen. Not every assignment does.
Summary: Your scheduling link and your list of nearby collection sites both come from the screening provider's invitation email, so a fresh invitation is the fix for almost every problem here. Search your inbox and spam for it first, then ask your staffing partner or support@ascen.com to send a new one.
Find the original invitation first
The invitation email from the screening provider is what carries your scheduling link, your authorization details, and the collection sites near you. Search your inbox and your spam folder for it before doing anything else, including any message you may have skimmed and filed while you were working through onboarding.
If the link has expired or will not open
Invitations are time limited, so one issued a while ago may no longer work. They cannot be renewed by clicking again. Ask for a new one:
Your staffing partner ordered the screening and can request a fresh invitation.
support@ascen.com can also arrange it. Include your full name, your start date, and the date of the original invitation if you still have it.
If you cannot find a site near you
Collection sites are searched by postal code from the provider's scheduling page. If nothing suitable comes back, widen the radius, then tell your staffing partner where you actually are. Rural areas and islands sometimes need a site to be arranged specially, and travellers occasionally need one near the assignment rather than near home, which is a normal request and not a problem.
If you cannot make your appointment in time
Say so early. Your staffing partner may need to move your start date, and telling them before the deadline passes is far easier than explaining a missed screening afterwards. A missed or expired screening does not by itself mean losing the assignment, but leaving it unsaid can delay your start.
Keep the rest of your onboarding moving
A pending drug screen does not block the other steps in your checklist. Finish everything else at app.ascen.com so the screening is the only thing outstanding. See Getting started: your onboarding checklist, and Why is the background check taking longer than expected? if the screening is complete but the overall check is not.