There should be a unique URL for each task, often the easiest way to lead someone to a task is a unique URL that will open up the task directly. For example, in Jira, if your Jira instance is hosted at companyxyz.atlassian.net and the project key is DEV, the ticket for issue number 456 would be: https://companyxyz.atlassian.net/browse/DEV-456 and from this URL I know, company, project, ticket number and can use this URL to get directly to said ticket.