Check the size of your ship!
Certain hangars in the 'verse are not built to handle the larger sized vessels that are available for players to use. At the current time, only the hangars at Area 18 and Lorville are able to support larger ships like the Reclaimer and the 890 Jump. If you are having difficulty recovering your ship at a hangar, check to ensure the location can support a ship of that size and move to a location that has a larger capacity if not.
If your ship is getting stored too quickly at the hangar platform...
...spawn a different ship first, then spawn your intended ship. At the current time, all backers have access to a Freelancer in order to address another issue, so everyone will have multiple ships to fly regardless of their pledge levels. If you are encountering this issue, spawn the temporary freebie Freelancer first, then spawn the ship you intended to fly.
Check for any bugs or other known issues!
Carefully read any error message that is returned. These messages will most often give you information on why your ship is not available for you at the current time and generally what you will need to do or wait for to be able to get your ship.
At the current moment, we are very aware of the "Failed to retrieve vehicle" error that looks like this:
Should you encounter this error, please add all information that you can to our Issue Council bug at this link: STARC-104688
Most of the time, this can be resolved by hitching a ride to another location and attempting to retrieve your ships from there instead. However, if going to a different system fails to resolve this, then you can try purchasing some cargo into the ship that is receiving this error before traveling to another location.
If both those steps fail, then you will need to do a Character Reset.
We can't stress enough how important it is to report errors encountered in the correct place, which is the Issue Council. If you are constantly encountering a specific error or other issue with your ships, adding your repetition steps and info will help us find them and fix them.