Cloudflare b2-proxy

Hi guys, I have a backblaze bucket connected to my nexcloud instance, I want to make all communication between nexcloudcloud and backblaze go through cloudflare
To try to make that work create a cloudflare worker using the repository

After the worker is running nextcloud doesn’t connect using the worker url, but I can upload one or more files using the aws command line and the worker url
Can someone tell me what could be going on?