The link sent to the customer may not be formatted correctly, causing it to redirect to the PostNL homepage instead of the tracking page. This can be fixed by checking the configuration settings and ensuring the email client and browser being used are compatible with the tracking link format. Contacting PostNL support or the software developer may be necessary if the issue persists.
If you are still facing the issue it is always a better idea to look for a solution that streamlines your tracking and shipping. In such a case, you may want to consider using an alternative app like thePH MultiCarrier shipping label app.