This plugin uses Crowdin API v1, which is marked as deprecated. You cannot generate a v1 key now, only a v2 key. The old v1 keys still work.
The problem is that the v2 key does not allow you to use the v1 API.
Drone CI pipline logs:
latest: Pulling from jonasfranz/crowdin
Digest: sha256:84e08cd6f4374a9eb1e74118c26a2b83890e2d4d0c629f8d2a7df9f9514efb90
Status: Image is up to date for jonasfranz/crowdin:latest
2022/12/01 08:56:22 error while building languages: Error from crowdin: Requested project doesn't exist or the API key is invalid (error code 1)
This plugin uses Crowdin API v1, which is marked as deprecated. You cannot generate a v1 key now, only a v2 key. The old v1 keys still work.
The problem is that the v2 key does not allow you to use the v1 API.
Drone CI pipline logs:
The same problem, but in a different library: https://github.com/crowdin/crowdin-api-client-js/issues/76
Please update to Crowdin API v2.