Problem with LiteSpeed Cache plugin
Add this to the field “Do Not Cache URIs” in the tab Excludes
/checkout?cart_key_restore=
/wp-json/wc/store/cart
Or if you use any cache plugin try to ignore that API URL
Problem with hosting not supporting Authentication header
You can try this to enable it on your website.
Most shared hosts have disabled the HTTP Authorization Header by default.
To enable this option you’ll need to edit your .htaccess file by adding the following:
RewriteEngine on
RewriteCond %{HTTP:Authorization} ^(.*)
RewriteRule ^(.*) - [E=HTTP_AUTHORIZATION:%1]
WPENGINE
To enable this option you’ll need to edit your .htaccess file by adding the following (see https://github.com/Tmeister/wp-api-jwt-auth/issues/1):
SetEnvIf Authorization "(.*)" HTTP_AUTHORIZATION=$1