Google Maps Platform rejected your request

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Google map in iframe load rejected
**How can this issue be reproduced? **

  1. visit https://www.tickettailor.com/events/wonkhe1/329411
  2. embedded map in iframe at bottom of page.
  3. Map shows up in Chrome and Firefox. In Brave there is an error.

Google Maps Platform rejected your request. This IP, site or mobile application is not authorized to use this API key. Request received from IP address 86.25.101.62, with referer: https://google.com/

Expected result:
Map shown

Brave Version( check About Brave):
Version 1.2.43 Chromium: 79.0.3945.130 (Official Build) (32-bit)

Additional Information:

EDIT: seems to be something to do with cross-site cookies. Allowing all cookies allows the map to load. Any web-developer suggest a workaround?