I am looking at the documentation and it says
Rating Package Web Service Developer Guide February 16, 2021© 2020 United Parcel Service of America, Inc. All Rights Reserved. Confidential and Proprietary
Integration Testing
All URLs are case sensitive.
For integration testing, direct your Rating Package Web Service to: https://wwwcie.ups.com/webservices/Rate Production All URLs are case sensitive.
Once testing is complete, direct your Rating Package Web Service API to the production URL:https://onlinetools.ups.com/webservices/Rate
Old version
$this->host = ((MODULE_SHIPPING_UPSXML_RATES_MODE == 'Test') ? 'wwwcie.ups.com' : 'www.ups.com'); */
$this->path = '/ups.app/xml/Rate';
$this->transitpath = '/ups.app/xml/TimeInTransit'; */
New version:
$this->host = ((MODULE_SHIPPING_UPSXML_RATES_MODE == 'Test') ? 'wwwcie.ups.com' : 'onlinetools.ups.com');
$this->path = '/webservices/Rate';
$this->transitpath = '/webservices/TimeInTransit';
is not working for me either.