Token validation failed.
The message
Token validation failed.What it means
Suno refused to start a song because the request didn't carry a valid CAPTCHA token (a proof that a person is at the keyboard). It turns up almost always in tools that call Suno's web endpoints from a script.
What to do
Generate the song on suno.com in a browser. If you're using an unofficial API wrapper, the wrapper has fallen behind Suno's current checks and needs an update from its maintainer.
This is the whole of what Suno sends back:
Token validation failed.In a log it usually shows up as the raw response body, with HTTP status 422 (the server understood the request but won't act on it):
{"detail":"Token validation failed."}We couldn't find this phrase in Suno's help center, and no Suno staff reply about it turned up either (as of September 25, 2026). What we did find is a run of GitHub threads, from November 2024 through August 2026, where people running unofficial Suno API wrappers hit it and worked out what it is. They agree with each other, so that's what this page rests on.
Which token it means
Your login is fine when this appears. A February 2026 report on one wrapper (0xshugo/suno-api-mcp, issue #4) tested each step separately, and sign-in and the credit balance check both worked. Only the two generation endpoints, /api/generate/v2-web/ and /api/generate/v2/, came back 422. The generate request has a token field that has to hold a CAPTCHA token, and the tool was sending an empty one.
That matches the first wave in November 2024. In gochendong/suno-api issue #1, several people got {'detail': 'Token validation failed.'} on every request the same day, and one commenter traced it to a new CAPTCHA requirement on Suno's side. So a fresh cookie doesn't help (the reporter of gcui-art/suno-api issue #224 tried that first), because the cookie was never the problem.
Why it comes back after a fix
The wrappers work by copying what Suno's own website does, and Suno changes its website. An August 2026 pull request on gcui-art/suno-api says generation had been failing "for all users" since Suno redesigned its create page. The author found that Suno now tells the browser which CAPTCHA provider to use, and a token from the other one is refused with the same error. Every time Suno moves something, the wrappers break again until someone patches them.
One stopgap people reported in 2024: make a song by hand on suno.com in the same account first. The wrapper's maintainer suggested it, and a commenter found it bought "approximately 10 minutes before the error recurs". Another added that just logging in wasn't enough, it had to be a song made through the site. It wears off, so treat it as a stopgap.
What to do
- If you just want the song, make it on suno.com or in the Suno app. According to that August pull request the check runs as an invisible widget on the create page, so a person in a browser passes it without seeing anything.
- If a wrapper started failing on a day when nothing changed on your end, check its GitHub issues for a fresh thread about this error before changing your settings. In every wave we read, the cause was on Suno's side and the fix came as a wrapper update.
- Running out of credits looks different. In the February report the balance call kept succeeding while generation failed, so an empty balance isn't what this message is about.
What surprised us is how narrow it is. Everything about the account can check out, and one empty field in one request still stops the song.
Other lines the same feature prints
Match yours against these if the one at the top of the page is not quite it. They come from the same code and mean related things.
{"detail":"Token validation failed."}422 Token validation failed.token_validation_failedError generating custom audio: {"detail":"Token validation failed."}