You have not lost credits. A cell that fails because an engine errored is refunded automatically, and the refund is on your billing page as a line you can see.
Some cells failed
Normal, and usually temporary. AI providers rate-limit, time out and occasionally return nothing. Those cells are excluded from your score rather than counted as zero. Reporting our own error as you losing a position would be the worst thing this product could do. Re-run when you like; the cells that succeeded are cached and will not be charged again.
The whole scan says “needs attention”
Usually one of three things: your site was unreachable when we crawled it, it blocked us, or no engine was available. The scan screen names which. If your site blocks unknown crawlers at the firewall or CDN, that is worth knowing on its own. It is very likely blocking the AI engines too, which the readiness checks will also flag.
It seems stuck
A full scan across five engines takes a few minutes. The progress screen updates on its own and keeps running if you close the tab. If nothing has moved for more than fifteen minutes, send us the scan link. The per-cell log is stored, so we can see exactly where it stopped rather than guessing.