Apple Watch Series 10
I can't use one of my apps
Solution 2 of 2: The software on your Apple Watch hasn't been updated to the latest version
It's recommended that you update your Apple Watch with the newest software, as the manufacturer continuously corrects errors.
On your phone: Press Watch.
On your phone: Press My Watch.
On your phone: Press General.
On your phone: Press Software Update. If a new software version is available, it's displayed. Follow the instructions on the screen to update the Apple Watch software.