That depends on the age of the garage door opener.

if you’re opener is newer, it will need a repeater plugged in for it to work

There are several references to it here on the forum. Best to do the research to see if your opener will accept this and if indeed it’s your problem.

I discovered this after many failed attempts to sync the homelink with my Chamberlain opener

LiftMaster 855lm Homelink Repeater Kit

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I had the same problem 5 years ago when I bought my 07 , I contacted the maker of the garage door opener a 2013 model and got additional info that made it work

 

Our cars use an earlier version of Homelink than what is produced today. My 2012 Honda's Homelink can open both garage doors, but the Crossfire's Homelink can open neither. That is because my garage door openers are more modern, and use a newer version of Homelink software. I have read lots of suggestions as to what worked for the specific poster, but none worked for me, as the poster could have had any garage door opener from any year.
Homelink's web site lets us type in which opener we have, which car, and then tells us what we need based upon the software used in Homelink in different years. For my 2012 Honda, the website shows the onboard Homelink is compatible with my modern garage door opener. For my 2005 Crossfire, the website says I needed a bridge shown in the post above. The bridge is basically a software translator from old to new. I just installed the bridge and have put the Crossfire's Homelink in service.

 

I find myself in the same boat and need this gizmo, I just have to spring for the money.
My wife says it’s a waste of money, but I am the one who gets to park in the garage, the other side of the garage is filled with odds and ends, snow blower, lawn tractor etc.
I use the original remote control. My wife’s newer car opens the door with no problem.