I'm not sure if you are the same person as this other post or a different person, but:

On the 2019 return, if the asset was "placed in service" before 2019, was the "prior depreciation" filled in on the Asset Entry Worksheet?  If it was not your client in the year it was "placed in service", the "prior depreciation" needs to be filled in, or else nothing will be carried to the next year.

Did you transfer your clients really early in the year? If so, that frequently causes problems. It is generally recommended to not transfer your clients until at least January.