--- title: "Troubleshooting · EenFactuurMaken.nl" description: "Solutions to common problems in EenFactuurMaken.nl. Can't finalise an invoice, email not arriving, limits, DNS for your email domain, API and MCP errors." url: "https://eenfactuurmaken.nl/en/docs/troubleshooting" markdown_url: "https://eenfactuurmaken.nl/en/docs/troubleshooting.md" language: "en-GB" --- # Troubleshooting Solutions to common problems in EenFactuurMaken.nl. Can't finalise an invoice, email not arriving, limits, DNS for your email domain, API and MCP errors. ## Signing in and account ### I didn't get a confirmation email - Check your spam or junk folder. The email comes from EenFactuurMaken.nl. - Check that your email address is spelled correctly. - Request a new link on the sign-in page. A link is valid for 24 hours. - Working at a company with a strict spam filter? Ask your IT department to allow email from EenFactuurMaken.nl. ### I can't sign in - Forgot your password? Use [Forgot password?](https://eenfactuurmaken.nl/en/forgot-password). - Asked for a code and you don't have your phone? Choose a code by email or use a backup code. See [2FA and passkeys](https://eenfactuurmaken.nl/en/docs/security/two-factor). - Tried a wrong code too often? Wait a minute. ### "Sign in again" when changing my IBAN For sensitive changes you must have signed in within the last 15 minutes. Sign out and back in, then try again. ## Invoices ### I can't finalise the invoice Open the invoice and look in the checks panel for items marked **Required**. Click the button next to an item to fix it. The most common ones: - Your business details are incomplete (name, address, postcode, VAT ID, KvK number). Complete them under [Business details](https://eenfactuurmaken.nl/en/docs/getting-started/business-details). - With reverse charge or an EU customer, your customer's VAT number is missing, or VIES says it's invalid. - With another currency, the exchange rate is missing. All items are listed in [Invoice checks](https://eenfactuurmaken.nl/en/docs/invoices/checks). ### "This invoice number is already in use" You chose your own number and it already exists. Keep the suggested number, or choose another one. See [Invoice numbering](https://eenfactuurmaken.nl/en/docs/invoices/numbering#custom-number). ### I can't create a new invoice On the Free plan you have 5 invoices per calendar month. At the bottom of the menu you see how many you've used this month (for example _5 of 5 invoices this month_). Delete an unused draft, wait until next month or upgrade to Pro. A credit note is always possible. See [Free and Pro](https://eenfactuurmaken.nl/en/docs/billing/plans#invoice-limit). ### My invoice has no payment QR code The QR code only appears on invoices in euros, with an IBAN in your business details, that haven't been paid yet, and when it's turned on in your layout and on the invoice. See [Payments and status](https://eenfactuurmaken.nl/en/docs/invoices/payments#epc-qr). ### No UBL is attached to my email Without a KvK number we don't create a UBL. And we only attach the UBL if your customer has a Peppol ID, KvK number or EU VAT number. See [PDF and e-invoice](https://eenfactuurmaken.nl/en/docs/invoices/pdf-and-ubl#no-ubl). ### I can't cancel an invoice You can't cancel a paid invoice or an invoice with a credit note. Create a credit note instead. See [Duplicate, cancel, delete](https://eenfactuurmaken.nl/en/docs/invoices/copy-cancel-delete#cancel). ## Email ### My customer didn't receive the invoice 1. Check the status under **Settings → Email → Sent emails**. **Bounced** means your customer's mail server refused it, often because of a typo in the address. **Failed** with "Suppressed" means we no longer email this address, because it bounced before or the recipient marked our email as spam. Is the address right and does your customer want the email again? Email support and we'll take the address off that list. 2. Check the email address on the customer. 3. Ask your customer to look in their spam folder. 4. Send them the link to the [online invoice](https://eenfactuurmaken.nl/en/docs/invoices/online-invoice), for example through WhatsApp. 5. With Pro: send from your [own domain](https://eenfactuurmaken.nl/en/docs/email-domain). That arrives more reliably. ### "Not allowed on Free" On the Free plan you can only email the address (and cc addresses) of the invoice's customer, or yourself. Update the address on the customer. See [Sending by email](https://eenfactuurmaken.nl/en/docs/invoices/sending#free-recipients). ### "Too many emails" You've reached the limit (Free: 30 recipients per 24 hours; Pro: 500 an hour; the same invoice at most 5 times per 24 hours). Try again later. See [Sending by email](https://eenfactuurmaken.nl/en/docs/invoices/sending#limits). ### My email domain stays on "Waiting for DNS" - Check that you've added **all required records**: the TXT for `_eenfactuurmaken`, the DKIM TXT for `resend._domainkey`, and the CNAMEs for `send` and `rsend` (or the records EenFactuurMaken.nl shows you). - Check that your domain provider didn't add your domain name twice (`send.yourcompany.com.yourcompany.com`). If so, only enter the part before your domain. - Copy the DKIM value in one go. Some providers cut off long values or add spaces. - On Cloudflare: turn the proxy off (grey cloud) for CNAME records. - DNS changes can take up to 48 hours. Click **Check again** once the records are there. After 72 hours without success we remove the request; then add the domain again. ### "This domain is already connected to another account at our email service" You (or your web developer) already use that service (Resend) for this domain. Use a subdomain, like `mail.yourcompany.com`. See [Your own email domain](https://eenfactuurmaken.nl/en/docs/email-domain#provider-conflict). See [Your own email domain](https://eenfactuurmaken.nl/en/docs/email-domain). ## Subscription ### My payment went through, but I don't have Pro yet Refresh the subscription page after a few minutes or click **Check again**. You also get an email as soon as the payment has been processed. Still not working after an hour? Email us. ### My automatic payment failed You keep Pro for another 14 days. Click **Pay again** under **Settings → Subscription**. See [Upgrading and cancelling](https://eenfactuurmaken.nl/en/docs/billing/subscription#failed). ## API | Problem | Solution | | --- | --- | | `401 invalid_api_key` | The key was copied wrong, revoked or has expired. Create a new one. | | `403 session_required` | This only works in the web app, for example changing your IBAN. | | `403 bad_origin` | You're sending a session cookie from another website. Use an API key. | | `409 invoice_locked` | The invoice is finalised. Create a credit note. | | `422 validation_failed` | Check `data.details` to see which field is wrong. Amounts are whole cents (`unitPriceCents`). | | `429 rate_limited` | More than 120 requests a minute. Wait for the `Retry-After` time. | See [Errors and limits](https://eenfactuurmaken.nl/en/docs/api/errors). ## MCP and AI assistants ### My AI app doesn't see the EenFactuurMaken.nl tools - Restart the app after changing the configuration. - Check that the server is **on** in the app's MCP settings. - Check the URL: `https://eenfactuurmaken.nl/mcp` (without a trailing `/`). - Using an API key? Check that the header is `Authorization: Bearer efm_…` (with a space after Bearer). ### Signing in with OAuth doesn't work - Allow pop-ups for the AI app, so the sign-in window can open. - First sign in to EenFactuurMaken.nl normally in the same browser. - Disconnect the app under **Settings → API & AI → Connected apps** and connect again. ### My assistant says the invoice isn't compliant Ask your assistant which items are missing; it gets a tip for each one. Often it's your own business details. See [Invoice checks](https://eenfactuurmaken.nl/en/docs/invoices/checks). ## Still need help? Email us through the [contact page](https://eenfactuurmaken.nl/en/contact). Include what you did, what you expected and what happened, and the error code if there is one. Never send your password or API key. Last updated on 13 October 2026