ISSUE:

The "Notify me" button is not available on out-of-stock sizes:

(1. Disable custom theme and set Luma as frontend => sizes are not clickable

2. Disable some modules (third party and custom) => sizes are not clickable

3. There are no errors related to the module or product pages nor in Magento logs, nor in console log)


SOLUTION:

Our module has not been compatible with the site disabling MSI yet.


To resolve the issue, please edit the file app/code/Bss/ProductStockAlert/Plugin/Helper/ConfigurableHelper.php :


Or download the file attached below to override the current file on your site.


If you need any further assistance, please feel free to contact us. We'd be happy to support you!