Air drop does not work? help!

hey!
tried transferring files imac macbook pro , when send them through air drop says transferal canceled after tried send something, why that? tried send macbook pro imac , got error message said" apple id certificate "xxx imac" invalid. transfer has been canceled. how fix this?!?!? help!!!

 

not sure, can try tried. restart finder on both macs. fixed issue.

 

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