If your internet meets Disney's minimum speed requirements and still displays disney plus error code 42, it could be caused by either your WiFi router or Internet modem. In such a situation, unplugging them for two minutes before plugging them back in may solve the problem as it might also help if you've attempted changing network settings or clearing cache and data on them.
An outdated app version is another likely cause of disney plus error code 42, as it may lead to connectivity problems and other glitches that result in glitches with connectivity or other functions of Disney Plus. Updating it may help eliminate this issue.
Technical issues can sometimes cause servers for a particular platform to go down, leaving no choice but waiting. You can check to see if your platform's servers are down by visiting websites such as Downdetector; once the servers have come back online, try accessing Disney+ again via its app.
Consider switching devices and trying Disney Plus again on that device to see if the error persists on both. It could be that your device isn't compatible with Disney Plus; make sure it meets their minimum hardware specifications before proceeding further. If this solution doesn't work, try resetting your wireless and internet hardware, updating Disney Plus app, testing various Internet speeds, clearing data cache and clearing cache, clearing history cache or even reinstalling app - but if none of this helps then contact Disney Plus customer support immediately for support.