The third party app may not have access to your Remember The Milk feed, or may be experiencing a temporary issue.
Please try the following to resolve the issue:
1. Enable private addresses
If you are using an online feed reader (such as Google Reader) that does not support authentication, please ensure that you have enabled private addresses for your Remember The Milk account.
2. Subscribe to an individual list
If your feed reader does not support authentication, in addition to enabling private addresses, please ensure that you are subscribing to an individual list or Smart List. The 'All Lists' feed will not work without authentication, even with private addresses enabled.
3. Try again in case of a temporary issue
In case your feed reader is experiencing a temporary issue with subscriptions (or there is a temporary issue with Remember The Milk), please wait a few hours and try to subscribe again.
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