How to submit a ticket for requesting an inactive account gamertag to be reset?

How do you know it's inactive? Gamertags are used on several Microsoft services,not just Xbox live,so there is no way to know if a gamertag is inactive or not.

Just because a gamertag has low gamerscore of hasn't logged into Xbox live for a certain amount of time does not mean it's inactive.

There's no way to request a gamertag to be freed up.

This is some major L right here, there's a username from someone who has been inactive for EIGHT years and you're telling us that we can't recover the tags from people like that?

There's no way to request a gamertag to be freed up.

I want to change my gamertag to the name I use on all other platforms, the gamertag is used by an inactive (atleast 5 years inactive) Xbox account. How can this gamertag be reset so that I can use it on my own account?

If they sign into the Microsoft account their xbox gamertag is tied to in order check their email at least once every 2 years then this will also make their account (active) and basically would never have their gamertag reset as long as they do that.

Because of that there really is no way to know for sure if an account is inactive or not.

I'm Sorry but there is no way to have a gamertag to be reset. The tag system is use on other Microsoft services, so even if it's not being used on the Xbox 360 or Xbox One, it could be used elsewhere. If the gamertag is taken there's no way to request a
reset of that account even if it appears "Inactive." There might be a reset of some old inactive gamertags sometime in the future, but until then not much you can do.