More detail
Outages can be on the KRA side, not just yours, and the response is the same either way: the sale is recorded and held, and submission retries until it succeeds.
The instruction for staff is simple, keep serving, because the system handles the catch-up. The customer gets their receipt now, and KRA gets the invoice when the service returns.
Related questions
Should staff stop selling if eTIMS is down?
Does the customer still get a receipt?
Veira gives Kenyan shops one calm app for selling, M-Pesa, KRA eTIMS and stock, with a free terminal. Book a demo and see it set up for your trade.