We’re experiencing OAuth2 authentication failures when posting journal entries through our REST API integration. The system worked fine for months, but after scaling to support multiple tenants, we’re seeing consistent 401 Unauthorized errors.
Our OAuth2 scope configuration seems correct, but token validation is failing intermittently. The API gateway setup was recently updated to handle multi-tenant requests, and that’s when issues started.
POST /api/v1/journals HTTP/1.1
Authorization: Bearer eyJhbGc...
Content-Type: application/json
Response: 401 Unauthorized
This is blocking our financial sync processes across all tenant environments. Has anyone dealt with OAuth2 token validation issues in multi-tenant API setups?
Are you using service accounts or user OAuth tokens? For multi-tenant scenarios, service account impersonation often works better than direct user tokens. Also check your API gateway’s token validation middleware - it might be caching validation results and not handling tenant-specific scopes correctly. The gateway config needs explicit multi-tenant routing rules.
We’re using service accounts per tenant. The tokens are generated correctly with proper scopes, but validation fails randomly - maybe 30% of requests. Could this be a token refresh timing issue?
I’ve seen similar issues with multi-tenant OAuth2 setups. Usually it’s related to audience claims in the JWT token not matching what the API gateway expects. Check if your token includes the correct aud claim for each tenant. Also verify that your OAuth2 provider is issuing tokens with the proper scope hierarchy for multi-tenant access.