Hi @AnkurAhlawat. Thank you for your reply. I will raise a support ticket as it seems that no link can bypass their validation. I will keep you updated when resolved.

Thank you for your replies. That's true, It is mentioned in the documentation that the url should end in .git.The issue here is that both versions don't work for me. Here is a screenshot with your examples: @arunpatidar I am using AEMaaCS. 

Thank you for your reply, The repository is active and accessible via HTTPS. The problem is that any URL I try (Tried different repos as well) is considered invalid as seen in the screenshot.

I am trying to add an external repository in cloud manager by going to Repositories > Add Repository > Private Repository. But it seems that whatever url I enter, is considered invalid