I have Apple Watch 2 Series and iPhone 6S. Recently I've got an update to IOS 13 on iPhone and watchOS 6.1 on Apple Watch. After upgrade Reminders stopped syncing. I tried to resolve the problem by unpairing the watch and pairing it again using backup to restore. Now strange thing has happened: Wallet & Pay option disappeared from Apps list in Watch application. So I cannot add any cards to my watch anymore. Reminders app also disappeared from the watch. I tried to uninstall the iPhone app Reminders and install it again, but it didn't have any effect on the watch. To resolve problem with the Wallet & Pay on Apple Watch I tried to change regions on both iPhone and Apple Watch - no luck. iPhone have Apple Pay app and is able to manage cards.
Any ideas what I can try else to recover function of Wallet & Pay app and Reminders?
This is different from similar question, where OP could solve his problem by setting correct region for his watch. I already have region set to the country, which participates in Apple Pay programm.
The Wallet & Pay menu has reappeared in Watch App after I unpaired and paired the watch as a new device (not using backup to restore). Reminders and a bunch of other very useful apps is still not available on the watch. The problem becomes more clear: iPhone cannot install any app on the watch. In the watch management app on the iPhone it is visible that iPhone tries to start the installation - rotating circle, but nothing happens for many hours.
Resetting network settings on iPhone and joining again to Wifi seems to restore synchronization between iPhone and the watch: apps now can be installed, calendar get updates. Reminder app is still not available on the watch. Tried re-installing app on the phone: no luck.