Strapi error
Read the server log and the error's status code. If you log in to the admin panel and get sent straight back, the admin URL and cookie path don't match.
Contentful error
Check Contentful's status page, then the status code your site gets back: 401 is the access token, 404 the space or entry, 429 a rate limit.
Sanity error
If your site or Studio can't load Sanity data from a new address, add it to your project's allowed CORS origins. Otherwise check the token and dataset.
Prismic error
Check the access token if your repository is private, the repository name, and that content is published. Then read the status code from the failed request.
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