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W&B now issues longer API keys (about 86 characters). Older wandb SDK versions validate exactly 40 characters and reject the new format: ValueError: API key must be 40 characters long, yours was 86 On Dedicated Cloud or Self-Managed instances, the message may instead be ERROR API key must be 40 characters long, yours was 86.

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Upgrade the wandb SDK

Support for longer API keys was added in wandb v0.22.3, so upgrading to that version or later resolves the error: 
pip install -U wandb
wandb login --relogin

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If you cannot upgrade the SDK

  • If a legacy 40-character key is still active on your account, keep using it. New-format keys do not automatically revoke legacy keys.
  • If you deleted the legacy key and cannot upgrade, contact support@wandb.com. Dedicated Cloud and Self-Managed deployments might be able to issue a legacy-format key.
  • As a workaround, set WANDB_API_KEY in the environment instead of using wandb login. Some older SDK versions skip local length checks. Replace [API-KEY] with your W&B API key: 
    export WANDB_API_KEY=[API-KEY]

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Different error: key reported as too short

API key must have 40+ characters, has 20 can appear when calling wandb.Api().viewer.generate_api_key() in certain SDK versions. This is separate from the longer-key format migration. Upgrade the SDK. If the error persists after upgrading, contact support@wandb.com. For more information, see How do I find my API key? and SDK release notes.
API Keys Authentication SDK