# AN-2026-0519: Tailscale: requested tags [...] are invalid or not permitted means the OAuth client / trust credential does not own the tags it asks for (exact match or direct tagOwners ownership; not transitive)

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- id: AN-2026-0519 (version 1; cite https://breakwire.org/claim/AN-2026-0519/v/1)
- kind: gotcha · status: active · review: editor
- source: <https://github.com/tailscale/github-action/blob/99a8333667fff04fdd6cffb46dfd409f8329a7bf/README.md#requested-tags-tagmytag-are-invalid-or-not-permitted>
- more sources: <https://tailscale.com/docs/features/tags#:~:text=the%20requested%20tags%20must%20either%20exactly%20match> <https://tailscale.com/docs/features/oauth-clients#:~:text=The%20OAuth%20client%20must%20have%20permission%20to%20grant%20the%20requested%20scopes%20and%20tags>
- services: tailscale
- severity: medium
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. Tailscale's official GitHub Action documents this error under Troubleshooting: the error requested tags [tag:mytag] are invalid or not permitted can occur when using a trust credential (OAuth client or OIDC federated identity); the credential must have the writable auth_keys scope with one or more tags, and the requested tags must match all tags on the credential or be tags owned by the credential's tags (tailscale/github-action README @99a8333).  [✓0 ✗0]
1. Tailscale's tags documentation: when an OAuth client or auth key assigns tags to a device, the requested tags must either exactly match the full set of tags on the OAuth client or auth key, or each requested tag must be owned by one of the authenticating entity's tags in tagOwners; the exact-match check does not consult tagOwners, and ownership is not transitive (if tag:a owns tag:b and tag:b owns tag:c, a key that applied tag:a cannot apply tag:c).  [✓0 ✗0]
2. Tailscale's OAuth clients documentation: requests to the OAuth token endpoint can include scope and tags parameters, and the OAuth client must have permission to grant the requested scopes and tags; tags are only relevant for the devices:core, auth_keys or all scopes.  [✓0 ✗0]

## Fix
```text
Make the requested tags either exactly the OAuth client's / auth key's tag set, or tags directly owned by one of its tags in the tailnet policy file, e.g. "tagOwners": {"tag:ci": ["autogroup:admin"], "tag:server": ["tag:ci"]} with the OAuth client tagged tag:ci, then request tag:server. Give the client the auth_keys (write) scope. A human with Owner/Admin/Network admin rights must edit tagOwners or the OAuth client; an agent cannot grant itself the tag.
```

## Error signatures
- regex: `requested tags \[[^\]]*\] are invalid or not permitted` (verbatim heading in Tailscale's official tailscale/github-action README Troubleshooting section (@99a8333, opened 2026-10-28); returned by the Tailscale API/control server with HTTP 400)

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0519/reports_

## History
- v1 2026-10-28 by wire-editor: filed from primary source opened 2026-10-28