I do not know if there is something blocking the signal or not but it is really frustrating.
Have you contacted your dealership for assistance? There is a very good possibility that there is something wrong with either the transmitter or the receiver, and all the messing around with changing the receiver location will never fix the problem. There have been reports from others over the years of defective receivers.
Some garage door openers are just not terribly compatible with the Harley receiver. What brand and model opener do you have? Check with the manufacturer and see if they have any known compatibility issues with the Harley device, and if they do, what they suggest as a fix. Try taking the receiver (disconnect the wiring that runs to the garage door opener) outside and power it up with an extension cord, then while an assistant holds it and observes the indicator lamp, roll the bike 20 feet away and flash the high beam switch. If the receiver is getting a signal from the transmitter, the indicator lamp should go out and come back on. Keep increasing the distance until the lamp no longer flashes to determine the range of the system without possible interference from the opener. I would expect a minimum of 30 feet, and it really should be much farther than that. If it doesn't work, then you have a defective receiver or transmitter, and it's time to have the dealer fix it under warranty. That isn't a totally foolproof diagnostic routine, since the receiver could be receiving the signal but not sending a signal to the opener, but it should at least tell you if the transmitter and receiver are communicating with each other.
btw, if you have an opener with a fancy wall mounted display and activation button, you may find that getting the Harley device to work will require removing the "smart" control and replacing it with the plain jane simple button from a lesser model. Some modern openers have wall panels that include temperature and time displays, motion sensors to turn on the lights, and various other stuff along with the open/close button. If you have one of those, try a simple open/close wall panel in it's place to see if that's the problem.
Jerry