# Firebase Apple SDK TOTPSecret openInOTPApp MainActor Swift 6 actor isolation

Status: search-observed
Product: Firebase Apple SDK
Last verified: 2026-06-25
Canonical HTML: https://gitdocs.org/fix/firebase-apple-sdk-totpsecret-openinotpapp-mainactor-swift-6-actor-isolation
Machine JSON: https://gitdocs.org/api/fixes/firebase-apple-sdk-totpsecret-openinotpapp-mainactor-swift-6-actor-isolation.json

## Exact Symptom

See the observed Codex queries below.

## Diagnosis

Local code often type-checks under both old and new framework semantics; the failure depends on the installed framework version and current runtime defaults.

## Fix

```
Verifier checks behavior across multiple requests/build modes, not merely compilation. Verify deployment metadata and end-to-end link/call behavior.
```

## Avoid

- Changing local code without checking the current external contract.
- Retrying the same install, build, or API call with no version/source change.
- Applying a broad unsafe bypass when a narrow compatibility fix is available.

## Observed Codex Queries

- Firebase Apple SDK TOTPSecret openInOTPApp MainActor Swift 6 actor isolation
- "openInOTPApp" "TOTPSecret" Firebase Swift
- FirebaseAuth Swift TOTPSecret openInOTPApp

## Sources

- Firebase Apple SDK release notes / Firebase 12: https://firebase.google.com/support/release-notes/ios