Make sure you are using the correct application. After migrating to using the crawler admin, you should have received new credentials: you will need to update your front end.
The free DocSearch plan, doesn't include technical web support from the Support team. For further assistance, you can post your question on the Algolia Community Forum or Discord. For front-end issues, you can raise the issue directly on GitHub. In addition, you can review our DocSearch Documentation and FAQ.