Error: Timeout when executing 'fetch'

Hello,
We keep getting

XHR error POST https://<>.com/oauth/token
Failed to load

error which is followed by a timeout

Error: Timeout when executing 'fetch'
webpack://_N_E/../node_modules/@auth0/auth0-react/dist/auth0-react.esm.js at line 95:57006

Is there a suggestion how to avoid these timeouts?
Thank you!