Does he get's a white page or a page that the site can't be found?
With local, do you mean a local server in the network? Or on the same pc itself ?
Is the link that he gets from the mail with the correct adress in it ? (if local than probably 127.0.0.1:3000)
Where is metabase hosted? On your pc or a server?
Maybe stupid, but let's say it's running on your pc, and Metabase is configured as URL with 127.0.0.1 and then you colleague get's a mail with as link 127.0.0.1, it will off course not work.
It doesn't matter that you run with the jar file. I also work that way.
You can copy the link that he got from the e-mail and open that on the pc where metabase is locally running.
Or you make sure that the pc/server where metabase is runnning is accessible for other users and change the URL/ip of metabase to that ip adress.
I don't think you quite understood what I said.
You said your colleague had a link with an invite for Metabase.
Use that link but open that link on YOUR pc (assuming it's running on your pc offcourse).
Changing the URL/IP adress can be done from the settings menu in Metabase by an Administrator.
I don't want to be rude, but i think for that you will need to look for a colleague who has a bit more knowledge about networking etc.
I did my best to explain it to you already But I think you don't have enough background knowledge for it.
Also my guess is that you are running the jar file with the H2 database. Be aware this is not a secure way of working. You should install Metabase on a real database like PostgreSQL or something.
I think you could find some documentation about that on the Metabase website.