Bulk charge skips any invoice that already had an automatic payment attempt, even if that payment failed. The customer's timeline shows a note saying the invoice was skipped.
Why
Kolleno makes one automatic attempt per invoice. Retrying a failed payment is left to you, so you decide how many times and how often a customer is charged. Each retry is a new payment, and your payment provider may charge a fee for it.
How to collect it
Check why the first payment failed. If the mandate was canceled or the card expired, ask the customer for a new payment method first. Then either:
Charge it manually: on the customer's Invoices tab, select the invoice and click Charge customer. See Manually charge with card on file.
Retry it with a workflow: see Retry Auto-Charge in Workflow Automations.