When trying to assign a release to a work item, not all releases are showing in the list, why is this happening?
Here is a screen shot of the timeboxes page, the releases are current and exist in the appropriate project;
Here is a screen shot of the feature and the release drop down pick list showing only the Mayday release;
The Mayday 2 Release is in the Accepted state as shown in the first screen shot and therefore is not eligible to be assigned. This is working as designed.
If the user needs to assign the release then it must to be in a state other than Accepted.
The following screen shot shows the choices when neither release is accepted;