When you link to another community on lemmy with a absolute link like so Div/0 this links to that community directly from that instance’s domain. This means users who follow that link from other instances, will not be able to comment or subscribe. They will have to go back and edit their URL manually to workaround this.

If you instead link to a community using a relative link like so Div/0 it will lead them to the community using their own instance as a mediator, allowing them to interact with it naturally.

The source for the above relative link is like this [Div/0](/c/div0@lemmy.dbzer0.com). So basically just add only the /c/... part and ensure your instance’s domain is at the end