• If someone is kicked out of a group, you will not be able to join it even if you have the invite link.
• It displays 'his group is no longer accessible' or if the admin has blocked you from reading messages.
• The link to the group or channel you're attempting to access has been changed or revoked.
• Occasionally, if that group is deleted, you will see this.
• You won't be able to see it if the group or channel has blocked or banned you!

Read More: What are the another ways where the Skype can support you from?