Magento – Magento 2 Customer Password and Email Settings

I had the same, but a second error message appeared which said that a required field is not filled out. In general: when anything goes wrong when saving the customer, the said error message "Your password reset link has expired" shows up. So, pay attention to any additional error messages showing up or in your log files.

If you want to find out what's happening in detail, go to the file "app/code/core/Mage/Customer/controllers/AccountController.php" and modify the method resetPasswordPostAction temporarily. Inside the } catch (Exception $exception) { directive, add Mage::logException($exception);. After you have seen the error again, you can find the real error message in the file var/log/exception.log.

I just had a look and yes, it seems this function was removed in Magento 2. There is only the option to reset a password for a customer.

The benefit of this is that the customer will receive an e-mail with a link where they can set their own password. There is no need to tell/write the plain-text customer password to an admin.