I am also experiencing this same issue since installing 11.1. I either have to sign out of my Apple ID and sign back in or it sometimes works after toggling the handoff setting in general. I am using a M1 MacBook Air with an iPad pro late 2018 & iPhone 11 Pro max both on 14.3. My main issues have been with the copy & paste functionality being lost & also other handoff features with native apps.
Zuuti
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