Clicking on error count on the profiles list view leads to synchronization errors view, which presents a list of all the errors for the given profile.
Errors view contains a browseable list of all the Jira issue or TFS / Azure DevOps (formerly VSTS) work item pairs for which last synchronization failed. An existing entry for a given Jira issue or TFS / Azure DevOps (formerly VSTS) work item indicates, that as a result of a recent synchronization failure, there are some modifications, that has not been propagated, i.e. Jira issue and TFS / Azure DevOps (formerly VSTS) work item pair is in inconsistent state and therefore it potentially needs your attention.
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