Offline mode is not enabled on this terminal. Please enable offline support from headquarters.
Your question is little confusing. Are you trying to go offline from online mode (your screenshot shows you are online, which means you are connected to CSU), but your questions says you are trying to go online.
To use offline mode, you need to
1. Enable offline in the register setup in D365.
2. Install SCA by providing --installoffline.
3. Send a full of synch of 9999 to the offline DB.
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