Magento – We’re unable to send the password reset email in Magento 2

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.

You'll need to do some digging, as seen the catch (Exception $e){} method catches any exception and outputs that message.

Try logging the exception:

Mage::log($e, null, 'customer_password_reset.log');

Then you can inspect the log file & identify what is causing the issue & figure out how to resolve it.