Bubble.io and Backendless API. I'm Following Chris's walkthrough to connect Bubble.io to Boundless but errors when 'Initialize' call

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I was unable to reproduce your problem. I see that in the screenshot you provided you are using https://api.backendless.com while your application is in a European cluster, which means you have to use https://eu-api.backendless.com

Regards,
Inna