Access was denied

Recently I’ve been getting this error when doing reverse geocoding. It’s not consistent(after a few refresh its ok), sometimes the request can go through, but now it seems more frequent.

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Is that from backend server or a client? If backend server, perhaps can email to onemap to whitelist your server IP. I am guessing they have some rate limit imposted on each apikey.

Our app is hosted in the cloud. My screenshot is from my desktop chrome browser. Both are experiencing this error.