Okay I've solved it: Its important to convert the string to an NSString. The dictionary would become this:
let metadata : NSDictionary = [
HKMetadataKeySyncIdentifier : NSString(string: match.syncIdentifier.uuidString),
HKMetadataKeySyncVersion: match.syncVersion
]
I'm leaving it up here in case somebody else comes across the same problem
maxzoech
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Same here, I can't implement it on watchOS 7.3
It works on device for me!
(Sorry, can't edit my old post anymore)