I've tried a number of times for 2 of my dots to get offers from needy teams, where there are no teams open to them. However, no offers ever come through.
I've noticed that my two old kickers haven't been able to get a contract, but I haven't dug around to see if there really aren't any openings. It may very well be WAI, and I'd be OK with that.
I submitted for offers, got offers that I couldn't accept because when I would try I was getting the message "This team has put a cap on the number of players at this position." The first time this happened, it was with a team with 3 players at the position (WR).
Best bet is if you cannot get offers from teams, send in a support ticket explaining the situation and they will likely put you onto a team if there are any teams that need your position.
Just submitted for offers again and accepted 1 of 4 offers that I got with no issues this time. I've never had the issue I mentioned above until this off season.