Despite having full access, you cannot access a group that shows up in a search. When you click on a particular group, it leads to an inaccessible page.
- Hover over the search result for the group or right-click on it to get the group's URL.
- Choose Admin Console > System > Settings > Redirection Rules.
- If you find a URL that matches the group that you want to access, make sure it is still needed. Otherwise, remove the redirection rule.