Often, merchants tell us that their members can't login to their store, which means they can't access their member benefits.
How to resolve this issue
Here are the most common solutions to this problem:
Check the customer account in your Shopify admin
In the top-right corner, does it say
Resend account invite?
This means the customer has not created their customer account
Click on that link, and ask your customer to click the link in their email to set their password
Confirm the customer's email address
Sometimes, customers have multiple accounts under one name, and they purchased their membership with a different email address
Check the customer's email address in Simplee Memberships, and make sure that's the email address they're logging in with
These two checks should resolve the majority of these issues!