Connect tag s7-1500 tag is null, bad but device connection is connected

Dear All
I have problem about connect tag s7-5000 tag is null, bad
but device connection is connected .
I try restart OPC-UA, driver siemens is not good.
Help me please

Thank you for answer.

Did you set up all of the "Considerations" given in the manual?

https://docs.inductiveautomation.com/display/DOC81/Siemens#Siemens-Considerationsfor1200and1500Devices