W3TC with Cloudflare extension => not authenticated after correct saving message

What is the name of the domain?

.com

What is the error message?

Not authenticated

What is the issue you’re encountering

Impossible to link w3tc and cloudflare account in order to purge cloudflare within w3tc

What steps have you taken to resolve the issue?

Set dashboard profile in english
Disable AIOS firewall plugin
Create my own API key instead of using Global PI key

Screenshot of the error

Hi, my problem is strange.
More information, it is a multisite configuration.
Only one domain under Cloudflare.

The connection with cloudflare seems to be ok with credentials (email and api key), as the domain is shown. At save, the message is “Cloudflare credentials are saved successfully”.
But when purging the message is : Failed to purge Cloudflare cache: Not authenticated

Thanks for your help