Could you please confirm if API Portal 4.2.* is compatible with 9.4 yet or by when we could expect to have this compatibility in place. We are currently trying to upgrade to Gateway version 9.4, but Portal incompatibility is holding us back.
API Portal 4.2.x is not compatible with Gateway 9.4
Please use 4.3.1 of the Portal. It has just been released last week: CA API Developer Portal 4.3.1 Released - CA API Developer Portal - 4.3 - CA Technologies Documentation
See Release Notes: API Developer Portal - CA API Developer Portal - 4.3 - CA Technologies Documentation for more details on the new Portal version