Descent MK1 not uploading data to iPhone 11

Hi. Descent MK1 is not transferring my Apnea Hunt dives into my iPhone, has at least 5 days of diving over this month to catch up on. I have used the top right hand symbol to update several times and no joy.
My questions: why is this happening now? Have I Done something I am unaware of to either the watch or the phone settings? How do I get the data onto the phone.

Many thanks! 

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