Hi
The Apple Watch may be locked to your husband's Apple ID via Activation Lock, which prevents unauthorised use of Apple Watch if it is lost or stolen. (To remove Activation Lock, it should have been unpaired via the Watch app, rather than the watch being erased directly on the watch).
To be able to pair the watch to your own iPhone, ask your husband to either enter his Apple ID and password on your iPhone or to turn the feature off via https://www.icloud.com/ by signing in with his Apple ID > Settings > My Devices > Click on Apple Watch > Click on the "X" > click on Remove.
If he has already removed the Apple Watch from his account, the following steps may help:
Ask your husband to try unpairing the watch via the Watch app on his iPhone (even though the watch is no longer paired):
- On his iPhone, in the Watch app, go to: My Watch (tab) > tap on the name of the watch (at the top) > tap on the "i" icon next to the watch: if the button is available, tap on Unpair Apple Watch.
Try these steps on the Apple Watch and your own iPhone:
If the watch remains locked, I suggest that you contact Apple Support or make a Genius Bar appointment for assistance (be sure to take along your original proof of purchase for the watch):
More information:
About Activation Lock on your Apple Watch - Apple Support
