Okay a few things, first off I am working on another story, but this one just popped into my head, second of all this is a quick one shot, and third of all this is during the time period between when the Clone Wars ended and when they took down Palpatine, finally the Rebel alliance is in cells and the Jedi are spread out, as such they don't often meet and outright lie sometimes until they trust the person, but once that trust is gained the truth is revealed, oh and those on Ossus and Tython are also part of the alliance but are on different missions then those not on the planets frequently or are never on said planets for various reasons and are actively fighting back
"Hey Obi-wan, remember when I said that I had a feeling that we would be on Tattooine for some reason and we would meet with Han at the same time as you originally would?"
"Yes"
"Turns out that Kanan and his team need backup and we've been elected"
"And they're on Tattooine"
"Exactly"
As it would turn out the reason they would need Solo and Chewie is because both teams lost their transportation off the planet
"Okay now what?"
"Now we go to a Cantina and get a way off this planet, the Empire is still hunting for us Jedi after all, even if they know very few of us that survived, they want to hunt us few down not knowing the truth"
"Okay we'll go for us, we'll need a ship that can carry all of us"
"Oh don't worry about that, we have just the ship and person"
And so Anakin and Obi-wan go into the Cantina and convince Han Solo to give the group a ride and this time he willingly goes to Yavin IV, mostly because he was actually already part of the Rebel alliance, but a solo operative who used his smuggling past to the alliance's advantage, unfortunately he hadn't made contact it quite some time and was now missing and presumed dead
"This is Millennium Falcon calling Rebel headquarters, I repeat this is Millennium Falcon calling headquarters, respond please"
"Sorry, but we don't recognize you except as an impostor, Millennium Falcon disappeared six months ago"
"This is Ghost leader, we're here aboard a ship called the Millennium Falcon"
"This is General Kenobi, Millennium Falcon is alive, I repeat Millennium Falcon is alive"
"Very well send clearance codes"
"Clearance codes sent"
"Millennium Falcon you have some explaining to do"
"Sorry, short story is that I lost long range transmitter and have yet to replace it, entire story during debriefing"
"You'd better"
And so once he landed Han did indeed give the entire story as to why he was thought dead for so long, it turned out that in a fight against some Empire ships the Millennium Falcon had taken heavy damage and it took all he had just to get to Tattooine, where he continued to get lucky in that he never had to sell his ship or lose his freedom to repair the ship as much as he had, unfortunately he never could find the replacement parts for the long range transmitter and he wasn't about to ask the Hutts for permission to use their equipment to alert the Rebel alliance that he was still alive, thus the situation they had found themselves in where he was missing and presumed dead and as such wasn't believed without Ghost and Obi-wan vouching for him