Bold Subscriptions will not display the correct price in the subscription widget on the product page when the Shopify Market is set to a non-primary market. A non-primary market is a currency that does not match your store’s default currency.
In addition, the subscription customer portal is not compatible with shops who have assigned multiple custom domains through Shopify Markets. This means customers will not be able to log in and manage their subscriptions.
As a workaround, you can direct your customers to the main domain login page by changing the Manage Subscriptions link URL within the theme files. For example, you could use the following link amended to point to your store's main domain:
<a href="https://[Shopify name].myshopify.com/pages/my-subscriptions" class="text-link">Manage Subscriptions</a>