[Plugin: woocommerce] Simple product not adding to cart via add-to-cart URL

Website: https://www.norcalfll.org

The simple add-to-cart via URL is working when I am logged in as admin but not if I am logged in as author role or not logged in at all (guest).

The URL that I adding is the simple product: https://norcalfll.org/cart/?add-to-cart=1346 I can add this product if I go through the shop or product page. I have tried mobile and a different browser (firefox). This is just a symptom – I am trying to eventually get a variable product added programmatically (which is similarly only working if I am logged in as admin).

In searching, it seems that people point to server side caching (hostmonster is the ISP). How can I debug that is that is suspected?

I am pretty new to wordpress and woocommerce but trying to learn and not a software developer.

I have worked through the debugging steps that I have found online and the only thing that I can see is that the PHP server & MySQL are recommended to be 5.6. If I could avoid upgrading PHP that would be preferred since this is a subdomain and upgrading would have alot of ripple impact, but if that is the answer, then please let me know.

I have WP_DEBUG set to true – no errors show up in any error logs or on inspect.

I have tried with themes: Twenty Fifteen and Impreza and Impreza child. I do not have any caching plugin installed and all plugins disabled except those that are needed by woocommerce.

Please help – this is for a nonprofit – and paid support is likely out of the question. I am a volunteer for the nonprofit.

Here is the system status:

### WordPress Environment ###

Home URL: https://www.norcalfll.org
Site URL: https://www.norcalfll.org
WC Version: 2.6.4
Log Directory Writable: ?
WP Version: 4.5.3
WP Multisite: –
WP Memory Limit: 256 MB
WP Debug Mode: ?
WP Cron: ?
Language: en_US

### Server Environment ###

Server Info: Apache
PHP Version: ? 5.4.43 - We recommend a minimum PHP version of 5.6. See: How to update your PHP version
PHP Post Max Size: 64 MB
PHP Time Limit: 30
PHP Max Input Vars: 1000
cURL Version: 7.24.0
OpenSSL/1.0.0

SUHOSIN Installed: –
MySQL Version: ? 5.5.42 - We recommend a minimum MySQL version of 5.6. See: WordPress Requirements
Max Upload Size: 64 MB
Default Timezone is UTC: ?
fsockopen/cURL: ?
SoapClient: ?
DOMDocument: ?
GZip: ?
Multibyte String: ?
Remote Post: ?
Remote Get: ?

### Database ###

WC Database Version: 2.6.4
:
woocommerce_sessions: ?
woocommerce_api_keys: ?
woocommerce_attribute_taxonomies: ?
woocommerce_downloadable_product_permissions: ?
woocommerce_order_items: ?
woocommerce_order_itemmeta: ?
woocommerce_tax_rates: ?
woocommerce_tax_rate_locations: ?
woocommerce_shipping_zones: ?
woocommerce_shipping_zone_locations: ?
woocommerce_shipping_zone_methods: ?
woocommerce_payment_tokens: ?
woocommerce_payment_tokenmeta: ?

### Active Plugins (1) ###

WooCommerce: by WooThemes – 2.6.4

### Settings ###

Force SSL: –
Currency: USD ($)
Currency Position: left
Thousand Separator: ,
Decimal Separator: .
Number of Decimals: 2

### API ###

API Enabled: –

### WC Pages ###

Shop Base: #1192 - /shop/
Cart: #1193 - /cart/
Checkout: #1194 - /checkout/
My Account: #1195 - /my-account/

### Taxonomies ###

Product Types: external (external)
grouped (grouped)
simple (simple)
variable (variable)

### Theme ###

Name: Impreza
Version: 3.4.1
Author URL: https://us-themes.com/
Child Theme: ? – If you're modifying WooCommerce on a parent theme you didn't build personally
then we recommend using a child theme. See: How to create a child theme

WooCommerce Support: ?

### Templates ###

Overrides: –

https://www.ads-software.com/plugins/woocommerce/