Wasabi, CNAME, SSL not working

[signesize]

Hello,
We are trying to set Wasabi and Cloudflare as CDN.

Tutorial:

https://knowledgebase.wasabi.com/hc/en-us/articles/360018526192-How-do-I-use-Cloudflare-with-Wasabi-

1. We have set up Bucket

cdn.example.com

2. Policies in Bucket

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "PublicReadGetObject",
      "Effect": "Allow",
      "Principal": {
        "AWS": "*"
      },
      "Action": "s3:GetObject",
      "Resource": [
        "arn:aws:s3:::cdn.example.com",
        "arn:aws:s3:::cdn.example.com/*"
      ]
    }
  ]
}

3. We integrated links into our app

https://cdn.example.com/build/assets/app-27f627e3.css

4. We set CNAME record

TYPE, NAME, CONTENT
CNAME, cdn, s3.eu-central-2.wasabisys.com

However, despite many attempts, we cannot generate an SSL certificate.
We checked “Flexible, Full, Full strict” modes and enabled and disabled the proxy.
We waited a few days, but it doesn’t work.