UPDATE: I just tried this in an old campaign I have on Roll20. Using the json I got from the link below and my characterID I was able to successfully import my character. If you are still having trouble, the only other thing I can think of, is to make sure you don't have your character sheet set to private when you attempt to get the json.
It appears that they have turned off that version. If you use https://character-service.dndbeyond.com/character/v5/character/ I see I get a true return. I haven't had a chance to attempt to run that json through the beyondimporter, but if you are struggling that might work. If I get a couple minutes I'll try it myself.
UPDATE: I just tried this in an old campaign I have on Roll20. Using the json I got from the link below and my characterID I was able to successfully import my character. If you are still having trouble, the only other thing I can think of, is to make sure you don't have your character sheet set to private when you attempt to get the json.
It appears that they have turned off that version. If you use https://character-service.dndbeyond.com/character/v5/character/ I see I get a true return. I haven't had a chance to attempt to run that json through the beyondimporter, but if you are struggling that might work. If I get a couple minutes I'll try it myself.
The https://character-service.dndbeyond.com/character/v5/character/ gives the error:
"Unauthorized Access Attempt."
errorCode: 11eadfc
Any idea how to get it to work?