In the Feature Restricted mode you cannot save or write the running configuration. However, starting from the 17.1.1 release, you can execute the copy command except while copying to statup config/NVRAM, as startup configuration is write protected.
From the 17.1.1 release, when your device is in the Feature Restricted mode, if the hostname was previously Router#, it changes to (restricted)Router#. Renew your license to move out of the Feature Restricted mode
https://www.cisco.com/c/en/us/td/docs/routers/csr1000/software/configuration/b_CSR1000v_Configuration_Guide/b_CSR1000v_Configuration_Guide_chapter_01000.html
