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An invoice that will not book always has a reason, and the invoice carries it. Open the invoice and read the notices at the top first. If you would rather work down a list, here it is in the order these things actually happen.
1

Is it on hold?

A hold parks the invoice and keeps automatic processing off it. Release it, and it continues. See Notes and holds.
2

Is the supplier known?

An unresolved supplier stops everything after it. Pick the relation, or create the supplier from the invoice. The message The supplier is not linked to a relation in Exact means the same: choose the supplier and send again.
3

Do the totals add up?

A failed math check holds the invoice. Correct the lines, or record an override with a reason. See Checks.
4

Is a duplicate suspicion open?

Then Glimps will not book it automatically. Compare it with the invoice it points at. Delete one, or send it yourself if it is not a duplicate.
5

Is a bank account waiting for confirmation?

Call the supplier on a number you already had, then confirm or refuse the account.
6

Does every line have a ledger account?

And a VAT code, if your settings require one. An empty field blocks the booking on purpose.An invoice with no booking lines at all has nothing to send. Add the lines under General Ledger Accounts, or match the purchase order if it has one.
7

Did the purchase order match?

Fix the reading, ask the buyer, accept the difference, or book without the purchase order. See When an invoice does not match.
8

Does the contract match?

A tariff outside the agreed deviation, or a second invoice for the same period, holds the invoice. See Contracts.
9

Does it wait for an approval?

If the card says Waiting for approval, not booked yet, your company books after approval. Glimps books it by itself after the last approval. Authorizations > Active names the step and the person it waits on. Declined, not booked means an approver said no; see Declined invoices.
10

Is a purchase journal set?

Under Settings > Booking defaults. Without one, nothing can be booked in this administration.
11

Is Exact Online connected?

The invoice list shows a banner when the connection needs reconnecting.
12

Does it say Not sent to Exact yet?

Then an earlier send was held back before anything reached Exact, because the invoice still waited for approval or had an open notice. Nothing is in Exact. Settle the notice and send again.
13

Did Exact refuse it?

Then the invoice carries Exact’s own message. See Booking errors.
If the archive says Booked, the invoice is in Exact. To correct it, see Changing a booked invoice.

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Still stuck

Ask Luca. It can see the invoice, the checks, and the error at the same time, and it answers “why has this invoice not been booked” better than any list can. If Luca cannot explain it either, use the bug report button in the sidebar and include the invoice number.