Critical issues from site health

I got this messages from site health dashboard of my website
Background updates ensure that WordPress can auto-update if a security update is released for the version you are currently using.

1) Error A plugin has prevented updates by disabling wp_version_check().
Passed No version control systems were detected.
Passed Your installation of WordPress doesn’t require FTP credentials to perform updates.
Passed All of your WordPress files are writable.
2) Loopback requests are used to run scheduled events, and are also used by the built-in editors for themes and plugins to verify code stability.

The loopback request to your site failed, this means features relying on them are not currently working as expected.
Error: Too many redirects (http_request_failed)
Please how do I fix this, I have deactivated all my plugins yet nothing happened.