So you get the error that no ticket can be found
Lets start with https://signin.rockstargames.com/signin/user-form?cid=socialclub
The rockstar social club needs to be signed into and while you are there link your steam
Once this is done Launch GTA online and ensure the world is happy with the changes.
Next, you need to locate your FiveM launcher, the below is what you want to see.
The path may be different but the files should be the same.
Copy the path highlighted in the picture, we use this next.
Next is to add a non steam game to steam, so Launch Steam, then add FiveM
Click browse
This will paste the earlier folder path, then press enter.
Select FiveM
You then get back to this screen, make sure the tick is in the box and add selected program.
You can now launch this directly from steam, and the added bonus is your screenshots are saved in the same folder when you press F12
Hope this helps,
Regards Bendacat
Bananaboat... do do do do do