/admin-ajax.php net::ERR_TOO_MANY_REDIRECTS

Hi, I have a problem when trying to send a form that use admin-ajax.php. Does anyone know what is happening ? I did as much research as possible before posting.
Details:
Error found on Chrome’s console: Error: submit.js?ver=7.5.14:70 POST https://*.com/wp-admin/admin-ajax.php net::ERR_TOO_MANY_REDIRECTS

  1. WordPress website

  2. Domain registered on Cloudflare. Cf configs:
    3. DNS proxied by Cloudflare except the cname “mail” as it caused delivery issues
    4. Everything else turned off for the SSL
    5. Caching to standard, rest is off

  3. Hosting on cPanel, certificate issued by Lets Encrypt (I can’t remove it as it causes the site to load as an alias of the cPanel main domain without a valid certificate)

  4. Wordfence installed but even the problem occurs even without any other plugin.

  5. Tried to install the Cloudflare plugin but it never pass through the auto-config (loading loop)

  6. No redirect in .htaccess

  7. As a side question, can I change the nameserver of a domain registered on Clouflare ? I don’t find info, all infos are for the other way around.

Thank you very much for any input!
Regards

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