"2022-08-12 16:15:39.185088|WARNING |Accounting | |Unable to open licensekey.dat, falling back to limited functionality"
Ignore that line.
After server is created it should output. You can also find this in /logs/ts3server_*.log
2023-01-03 01:06:00.071135|WARNING |VirtualServer |1 |-------------------------------------------------------- 2023-01-03 01:06:00.071151|WARNING |VirtualServer |1 |ServerAdmin privilege key created, please use the line below 2023-01-03 01:06:00.071166|WARNING |VirtualServer |1 |token=lx4Rqhb+yralDQK+jn3NYAbhhdVW4p5v27gt2Yx6