As a security measure, Booking.com does not allow external links to be opened from their platform directly, therefore guests cannot open the online check-in link there.
However, Booking.com always sends the messages to the guests' personal email, so your guests must open the link from their personal email so it works correctly.
Good to know
Click here for more on Booking.com online check-in FAQ
Suggestion: add a note at the bottom of your pre-stay document informing your OTA guests about this so you can be proactive and avoid them contacting you with questions or thinking they are not able to online check-in. For example, “If you have booked from a booking channel that is not our official website page, please open the link from your personal email as it does not work from external platforms.”
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