When trying to archive a tag within the workspace admin page in Rally a red flare is seen that states "An error occurred while saving your changes.".
No further information is given.
Release : SAAS
This can occur if the tag length exceeds 32 characters. While the name may not appear to be longer than 32 characters on the screen, if the tag includes certain characters like &, the formatting code for those characters can cause the actual length to exceed 32 characters. See this article for further information: https://knowledge.broadcom.com/external/article?articleId=246296
One way to work around this is to use the Tag Management custom app found here: https://raw.githubusercontent.com/RallyTechServices/tag-management/master/src/javascript/app.js
See this video for a walkthrough on adding a custom app